scholarly journals Influence of molar ratio of MAI and PbI2 on synthesis of perovskite film

2021 ◽  
Author(s):  
Tung-Lung Wu ◽  
Jenn-Kai Tsai ◽  
Ya-Zhu Song ◽  
Meng-Xiu Chen ◽  
Tian-Chiuan Wu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Molar Concentration ◽  
Molar Ratio ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Molar Ratios ◽  
Furnace Tube ◽  
Synthetic Solution ◽  
Low Humidity

This study explores the influence of molar ratio of the synthetic solution of methylammonium iodide (MAI) and PbI2 on perovskite solar cells. The complete perovskite crystals must be produced in a low-humidity environment. The substrate is spin-coated in the adjusted MAPbI3 synthesis solution and annealed by using a nitrogen furnace tube to form perovskite crystals. During the crystallization of MAPbI3, some of the PbI2 remains, which improves the efficiency of the perovskite solar cell. Therefore, we adjust the molar concentration of MAI to find the appropriate amount of the PbI2 residual. We fix the MAI molar concentration at 1 M and adjust the PbI2 molar concentration from 0.8 M to 1.4 M. The molar ratios of MAI and PbI2 are, then, 1:0.8, 1:1, 1:1.2, and 1:1.4, respectively. Then, we use UV–vis, FE-SEM, and photoelectric conversion efficiency (PCE) measurements for comparing the growth of perovskite crystals and their photoelectric characteristics. The results show that 1.2 M of PbI2 is the most appropriate concentration for perovskite solar cells among the adjusted concentrations.

Low-Temperature Processed TiO2 Nanoparticle Layer with Inorganic Binder for Perovskite Solar Cell

2020 ◽  
Vol 12 (2) ◽  
pp. 276-281
Author(s):  
Seulki Cho ◽  
Jihun Jang ◽  
Mansik Jo ◽  
Sang-Woo Song ◽  
Suyeol Jang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Low Temperature ◽  
Short Circuit ◽  
Perovskite Solar Cells ◽  
Short Circuit Current ◽  
Titanium Isopropoxide ◽  
Molar Ratio ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Inorganic Binder

In this study, we report on the low-temperature (<120 °C) fabrication of a mesoporous titanium dioxide (TiO2) layer for use in perovskite solar cells. The TiO2 layer used was produced from a solution of TiO2 nanoparticles, purified water and titanium isopropoxide (TTIP) acting as a precursor of an inorganic binder network. We compared the properties of TiO2 layers resulting from different molar ratios (ranging from 0.1:1∼0.5:1) of titanium isopropoxide to TiO2 nanoparticles. Finally, perovskite solar cells were fabricated based on our optimized TiO2 molar ratio (TTIP:TiO2 = 0.1:1) and found to exhibit a short-circuit current density of ∼16.01 mA cm–2 and photoelectric conversion efficiency of ∼5.57%, respectively.

scholarly journals CuI/Spiro-OMeTAD Double-Layer Hole Transport Layer to Improve Photovoltaic Performance of Perovskite Solar Cells

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 978
Author(s):  
Chaoqun Lu ◽  
Weijia Zhang ◽  
Zhaoyi Jiang ◽  
Yulong Zhang ◽  
Cong Ni
Keyword(s):  
Solar Cells ◽  
Double Layer ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Perovskite Layer

The hole transport layer (HTL) is one of the main factors affecting the efficiency and stability of perovskite solar cells (PSCs). However, obtaining HTLs with the desired properties through current preparation techniques remains a challenge. In the present study, we propose a new method which can be used to achieve a double-layer HTL, by inserting a CuI layer between the perovskite layer and Spiro-OMeTAD layer via a solution spin coating process. The CuI layer deposited on the surface of the perovskite film directly covers the rough perovskite surface, covering the surface defects of the perovskite, while a layer of CuI film avoids the defects caused by Spiro-OMetad pinholes. The double-layer HTLs improve roughness and reduce charge recombination of the Spiro-OMeTAD layer, thereby resulting in superior hole extraction capabilities and faster hole mobility. The CuI/Spiro-OMeTAD double-layer HTLs-based devices were prepared in N2 gloveboxes and obtained an optimized PCE (photoelectric conversion efficiency) of 17.44%. Furthermore, their stability was improved due to the barrier effect of the inorganic CuI layer on the entry of air and moisture into the perovskite layer. The results demonstrate that another deposited CuI film is a promising method for realizing high-performance and air-stable PSCs.

scholarly journals Theoretical and experimental investigations on the bulk photovoltaic effect in lead-free perovskites MASnI3 and FASnI3

RSC Advances ◽  
2020 ◽  
Vol 10 (25) ◽  
pp. 14679-14688
Author(s):  
Liping Peng ◽  
Wei Xie
Keyword(s):  
Solar Cells ◽  
Conversion Efficiency ◽  
Photovoltaic Effect ◽  
Perovskite Solar Cells ◽  
Lead Free ◽  
Experimental Investigations ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion

Perovskite solar cells based on the lead free hybrid organic–inorganic CH3NH3SnI3 (MASnI3) and CH4N2SnI3 (FASnI3) perovskites were fabricated, and the photoelectric conversion efficiency (PCE) was assessed.

scholarly journals Effects of Decaphenylcyclopentasilane Addition on Photovoltaic Properties of Perovskite Solar Cells

Coatings ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 461 ◽  
Author(s):  
Masaya Taguchi ◽  
Atsushi Suzuki ◽  
Takeo Oku ◽  
Sakiko Fukunishi ◽  
Satoshi Minami ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Ambient Air ◽  
Open Circuit ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Perovskite Layer ◽  
Photovoltaic Properties ◽  
Photovoltaic Characteristics ◽  
Conversion Efficiencies

Perovskite solar cells, in which decaphenylcyclopentasilane (DPPS) layers were formed on the surface of the perovskite layer, were fabricated, and the influence on photovoltaic characteristics was investigated. The devices were fabricated by a spin-coating technique, and the surface morphology and crystal structures were investigated by scanning electron microscopy and X-ray diffraction. By adding the DPPS, the fill factor and open circuit voltage were increased, and the photoelectric conversion efficiency was improved. A stability test in ambient air was carried out for seven weeks, and the photoelectric conversion efficiencies were remarkably improved for the devices with DPPS.

scholarly journals GABr Post-Treatment for High-Performance MAPbI3 Solar Cells on Rigid Glass and Flexible Substrate

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 750
Author(s):  
Tingting Chen ◽  
Rui He ◽  
Fan Zhang ◽  
Xia Hao ◽  
Zhipeng Xuan ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Performance ◽  
Flexible Substrate ◽  
Perovskite Solar Cells ◽  
Post Treatment ◽  
Hysteresis Effect ◽  
Photoelectric Conversion Efficiency ◽  
Trap States ◽  
Photoelectric Conversion ◽  
Hybrid Perovskite

Perovskite solar cells have exhibited astonishing photoelectric conversion efficiency and have shown a promising future owing to the tunable content and outstanding optoelectrical property of hybrid perovskite. However, the devices with planar architecture still suffer from huge Voc loss and severe hysteresis effect. In this research, Guanidine hydrobromide (GABr) post-treatment is carried out to enhance the performance of MAPbI3 n-i-p planar perovskite solar cells. The detailed characterization of perovskite suggests that GABr post-treatment results in a smoother absorber layer, an obvious reduction of trap states and optimized energy level alignment. By utilizing GABr post-treatment, the Voc loss is reduced, and the hysteresis effect is alleviated effectively in MAPbI3 solar cells. As a result, solar cells based on glass substrate with efficiency exceeding 20%, Voc of 1.13 V and significantly mitigated hysteresis are fabricated successfully. Significantly, we also demonstrate the effectiveness of GABr post-treatment in flexible device, whose efficiency is enhanced from 15.77% to 17.57% mainly due to the elimination of Voc loss.

scholarly journals Reducing Defects in Organic-Lead Halide Perovskite Film by Delayed Thermal Annealing Combined with KI/I2 for Efficient Perovskite Solar Cells

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1607
Author(s):  
Kun-Mu Lee ◽  
Shun-Hsiang Chan ◽  
Wei-Hao Chiu ◽  
Seoungjun Ahn ◽  
Chang-Chieh Ting ◽  
...  
Keyword(s):  
Solar Cells ◽  
Thermal Annealing ◽  
Conversion Efficiency ◽  
Annealing Time ◽  
High Efficiency ◽  
Perovskite Solar Cells ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Perovskite Layer ◽  
Organic Lead

This study improved quality of CH3NH3PbI3 (MAPbI3) perovskite films by delaying thermal annealing in the spin coating process and introducing KI and I2 to prepare MAPbI3 films that were low in defects for high-efficiency perovskite solar cells. The influences of delayed thermal annealing time after coating the MAPbI3 perovskite layer on the crystallized perovskite, the morphology control of MAPbI3 films, and the photoelectric conversion efficiency of solar cells were investigated. The optimal delayed thermal annealing time was found to be 60 min at room temperature. The effect of KI/I2 additives on the growth of MAPbI3 films and the corresponding optimal delayed thermal annealing time were further investigated. The addition of KI/I2 can improve perovskite crystallinity, and the conductivity and carrier mobility of MAPbI3 films. Under optimized conditions, the photoelectric conversion efficiency of MAPbI3 perovskite solar cells can reach 19.36% under standard AM1.5G solar illumination of 100 mW/cm2.

Study on mesoporous layer of flexible solar cell based on perovskite structure

2018 ◽  
Vol 32 (34n36) ◽  
pp. 1840068
Author(s):  
Rui Liu ◽  
Yanyan Yuan
Keyword(s):  
Solar Cells ◽  
High Performance ◽  
Perovskite Solar Cells ◽  
Mesoporous Structure ◽  
Optical Transmittance ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Good Surface ◽  
Flexible Solar Cell ◽  
Convenient Preparation

Flexible solar cells have drawn wide attention because of their high photoelectric conversion efficiency, convenient preparation, excellent bendability and lower cost advantages. This paper introduces the effect of mesoporous layer on the morphology of CH3NH3PbI3 films. The uniformity and optical transmittance of the different films were also studied in detail. By adjusting the ratio of TiO2 and ZrO2, mesoporous structure of CH3NH3PbI3 perovskite solar cells were prepared by two-step spin coating. The fabricated films were investigated by XRD, SEM and spectrophotometer. The results indicate that perovskite layers have good surface morphology, density and coverage with TiO2 and ZrO2 composition ratio of 1:1. These well-structured thin films lay a good foundation for the preparation of high performance flexible perovskite solar cells.

Exploring the growth of MAPbI3 under different preparation methods for mesoporous perovskite solar cells

2021 ◽  
Author(s):  
Liguo Jin ◽  
Yuwen Wang ◽  
Jing Wu ◽  
LiPing Zhao ◽  
Hong Zhou ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electrochemical Impedance ◽  
Short Circuit ◽  
Critical Role ◽  
Perovskite Solar Cells ◽  
Photocurrent Density ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Preparation Methods ◽  
Mesoporous Film

The control of the perovskite growth morphology plays an extremely critical role in mesoporous perovskite solar cells. In this paper, anatase TiO2 nanoparticles (NPs) with high crystallinity were synthesized by a hydrothermal method, and the thickness of the TiO2 mesoporous film (TiO2-MT) was adjusted with concentration of TiO2-NP slurry by controlling ethanol. The perovskite layers were prepared by the traditional two-step (TTS) method, and the improved two-step (ITS) method was used. It is proved that different preparation processes of the perovskite light-absorbing layers have a certain influence on the photoelectric performance of the cell device, but also, the thickness of the TiO2mesoporous film affects the electron transport efficiency at the TiO2/MAPbI3 interface and the suppression of electron–hole recombination through [Formula: see text]–[Formula: see text] positive and negative scanning, electrochemical impedance spectroscopy (EIS) and dark state [Formula: see text]–[Formula: see text] curve analysis of the device. By optimizing the thickness of the TiO2 mesoporous film, the short-circuit photocurrent density ([Formula: see text] of mesoporous perovskite solar cells (M-PSCs) based on the TiO2 mesoporous electron transporting layer of 400 nm thickness is 23.85 mA/cm2, and the optimal photoelectric conversion efficiency (PCE) is 15.38%.

scholarly journals Study on Preparation and Stability of Perovskite Solar Cells with Supramolecular Interaction

2020 ◽  
Vol 185 ◽  
pp. 01065
Author(s):  
Qing Zhu ◽  
Chengsheng Li
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Optical Absorption Coefficient ◽  
Photoelectric Conversion Efficiency ◽  
Supramolecular Interaction ◽  
Photoelectric Conversion ◽  
Ion Migration ◽  
Photoelectric Properties ◽  
Perovskite Materials ◽  
The Stability

In recent years, perovskite solar cells have been developed rapidly because of its excellent crystalline properties, high optical absorption coefficient, high carrier mobility, long carrier life and direct band gap, and suitable to be used as light absorbing layer material of photovoltaic devices. However, the most prominent problem of perovskite materials is that a lot of organic cations will migrate and lose in the process of illumination or heating, which is considered to be the main reason for the performance degradation of perovskite films and devices. Therefore, the suppression of ion migration in perovskite is helpful to improve the stability of perovskite materials and devices and enhance their photoelectric properties. In order to effectively control the ion migration in perovskite films, this paper uses the cation-π supramolecular interaction, to prepare the perovskite films with better photoelectric performance and higher stability. The experimental results show that the photoelectric conversion efficiency of the perovskite solar cellsdevice doped with rubrene is increased from 18.60% to 20.86%, and the hysteresis of the cell is also significantly suppressed.

Insights into the photoelectric properties of the SnF2 and SnF4-doped FASnI3 Perovskite NanoFilm

2020 ◽  
Vol 16 ◽  
Author(s):  
Liping Peng ◽  
Wei Xie
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Perovskite Solar Cells ◽  
Correction Method ◽  
Photoelectric Conversion Efficiency ◽  
Generalized Gradient ◽  
Photoelectric Conversion ◽  
Photoelectric Properties ◽  
Photoelectric Performance ◽  
Negative Effect

Background: In this article, experimentally, we fabricated the FASnI3 perovskite solar cells base on the SnF2 and SnF4-doped FASnI3 nano-thin film materials, and got the photoelectric conversion efficiency (PCE) were 6.5 % and 5.59 %, respectively. Theoretically, we wanted to know why the PCE of SnF2-doped FASnI3 is higher than the SnF4- doped FASnI3. Methods: We built three kinds of model structures by the CASTEP, they were undoped and SnF2 and SnF4 doped FASnI3 perovskite structure models, respectively. The method was ultrasoft to calculate the interaction between electron-ion, with an electron exchange correction method of generalized gradient approximation and Perdew-Burke-Emzerhof method. Results: We found the probabilities of energy transfer between SnF2 molecule and around it molecules were the lowest among three structures. By integratedly analyzing optical properties, band structures, effective masses, and density of states (DOS) et al, we considered that SnF2 doping was superior to SnF4 doping in maintaining photoelectric properties of FASnI3. In addition, SnF2-doped FASnI3 possesses smaller hole effective mass than SnF4-dopedFASnI3, adding Sn4+ ion into perovskite as an shallow acceptor energy level can effectively reduce the optical absorption properties, however, adding Sn2+ ion into perovskite at an appropriate proportion can enhance its photoelectric performance of FASnI3. Conclusion: Sn4+ doping is a negative effect, and the Sn2+ doping is positive effect in promoting the photoelectric performance of FASnI3 perovskite. We considered that SnF2 doping was superior to SnF4 doping in maintaining photoelectric properties of FASnI3. We hope our results can help to deeply understand on Sn2+ and Sn4+ ion promoting the stability and high efficiency of FASnI3, and help strive to develop the lead-free perovskite solar cells.

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