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.

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.

Building smart TiO2 nanorod networks in/on the film of P25 nanoparticles for high-efficiency dye sensitized solar cells

RSC Advances ◽  
2014 ◽  
Vol 4 (25) ◽  
pp. 12944-12949 ◽  
Author(s):  
Yamin Feng ◽  
Jianhui Zhu ◽  
Jian Jiang ◽  
Wenwu Wang ◽  
Gaoxiang Meng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Conversion Efficiency ◽  
High Efficiency ◽  
Dye Sensitized Solar Cells ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Tio2 Nanorod ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

A novel hierarchical double-layered photoelectrode by integrating TiO2 nanorods (NRs) in and on a film of P25 NPs has been successfully synthesized on an FTO substrate; the hierarchical film electrodes applied in DSSCs exhibit a photoelectric conversion efficiency as high as 8.62%.

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.

scholarly journals Study on the properties of perovskite materials under light and different temperatures and electric fields based on DFT

RSC Advances ◽  
2020 ◽  
Vol 10 (35) ◽  
pp. 20960-20971
Author(s):  
Xin-Feng Diao ◽  
Yan-lin Tang ◽  
De-Yong Xiong ◽  
Ping-Rui Wang ◽  
Li-ke Gao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electric Fields ◽  
Conversion Efficiency ◽  
Perovskite Solar Cells ◽  
Commercial Production ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Perovskite Materials ◽  
Different Temperatures

The photoelectric conversion efficiency of perovskite solar cells has improved rapidly, but their stability is poor, which is an important factor that restricts their commercial production.

scholarly journals A general approach to high-efficiency perovskite solar cells by any antisolvent

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Alexander D. Taylor ◽  
Qing Sun ◽  
Katelyn P. Goetz ◽  
Qingzhi An ◽  
Tim Schramm ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Perovskite Solar Cells ◽  
Precursor Solution ◽  
Microstructural Characterization ◽  
Application Rate ◽  
Perovskite Layer ◽  
Highly Efficient ◽  
Application Procedure ◽  
Wide Range

AbstractDeposition of perovskite films by antisolvent engineering is a highly common method employed in perovskite photovoltaics research. Herein, we report on a general method that allows for the fabrication of highly efficient perovskite solar cells by any antisolvent via manipulation of the antisolvent application rate. Through detailed structural, compositional, and microstructural characterization of perovskite layers fabricated by 14 different antisolvents, we identify two key factors that influence the quality of the perovskite layer: the solubility of the organic precursors in the antisolvent and its miscibility with the host solvent(s) of the perovskite precursor solution, which combine to produce rate-dependent behavior during the antisolvent application step. Leveraging this, we produce devices with power conversion efficiencies (PCEs) that exceed 21% using a wide range of antisolvents. Moreover, we demonstrate that employing the optimal antisolvent application procedure allows for highly efficient solar cells to be fabricated from a broad range of precursor stoichiometries.

scholarly journals Effect of SnO2 Colloidal Dispersion Solution Concentration on the Quality of Perovskite Layer of Solar Cells

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 591
Author(s):  
Keke Song ◽  
Xiaoping Zou ◽  
Huiyin Zhang ◽  
Chunqian Zhang ◽  
Jin Cheng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Low Temperature ◽  
High Efficiency ◽  
Surface Condition ◽  
Perovskite Solar Cells ◽  
Colloidal Dispersion ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Perovskite Layer ◽  
Dispersion Solution

The electron transport layer (ETL) is critical to carrier extraction for perovskite solar cells (PSCs). Moreover, the morphology and surface condition of the ETL could influence the topography of the perovskite layer. ZnO, TiO2, and SnO2 were widely investigated as ETL materials. However, TiO2 requires a sintering process under high temperature and ZnO has the trouble of chemical instability. SnO2 possesses the advantages of low-temperature fabrication and high conductivity, which is critical to the performance of PSCs prepared under low temperature. Here, we optimized the morphology and property of SnO2 by modulating the concentration of a SnO2 colloidal dispersion solution. When adjusting the concentration of SnO2 colloidal dispersion solution to 5 wt.% (in water), SnO2 film indicated better performance and the perovskite film has a large grain size and smooth surface. Based on high efficiency (16.82%), the device keeps a low hysteresis index (0.23).

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