scholarly journals Charge Transfer in Mixed-Phase TiO2 Photoelectrodes for Perovskite Solar Cells

2020 ◽  
Vol 12 (3) ◽  
pp. 788 ◽  
Author(s):  
Anna Nikolskaia ◽  
Marina Vildanova ◽  
Sergey Kozlov ◽  
Nikolai Tsvetkov ◽  
Liudmila Larina ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Conversion Efficiency ◽  
Photoelectron Spectroscopy ◽  
High Efficiency ◽  
Anatase Phase ◽  
Perovskite Solar Cells ◽  
Band Alignment ◽  
Mixed Phase ◽  
X Ray

In mesoscopic perovskite solar cells (PSCs) the recombination processes within the TiO2 photoelectrode and at the TiO2/perovskite interface limit power conversion efficiency. To overcome this challenge, we investigated the effect of TiO2 phase composition on the electronic structure of TiO2 photoelectrodes, as well as on PSCs performance. For this, a set of PSCs based on TiO2 thin films with different content of anatase and rutile particles was fabricated under ambient conditions. X-ray diffraction, optical spectroscopy and scanning electron microscopy were used to study the structural, morphological and optical characteristics of TiO2 powders and TiO2-based thin films. X-ray photoelectron spectroscopy (XPS) analysis of anatase revealed a cliff conduction band alignment of 0.2 eV with respect to the rutile. Energy band alignment at the anatase/rutile/perovskite interfaces deduced from the XPS data provides the possibility for interparticle electron transport from the rutile to anatase phase and the efficient blocking of electron recombination at the TiO2/perovskite interface, leading to efficient electron-hole separation in PSCs based on mixed-phase TiO2 photoelectrodes. PSCs based on TiO2 layers with 60/40 anatase/rutile ratio were characterized by optimized charge extraction and low level of recombination at the perovskite/TiO2 interface and showed the best energy conversion efficiency of 13.4% among the studied PSCs. Obtained results provide a simple and effective approach towards the development of the next generation high efficiency PSCs.

An investigation of physical properties and photovoltaic performance of methylammonium lead-tin iodide (CH3NH3Sn1-xPbxI3) solar cells

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Omid Malekan ◽  
Mehdi Adelifard ◽  
Mohamad Mehdi Bagheri Mohagheghi
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Conversion Efficiency ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
X Ray Diffraction ◽  
Content Type ◽  
X Ray ◽  
High Absorption Coefficient ◽  
High Absorption

Purpose In the past several years, CH3NH3PbI3 perovskite material has been extensively evaluated as an absorber layer of perovskite solar cells due to its excellent structural and optical properties, and greater than 22% conversion efficiency. However, improvement and future commercialization of solar cells based on CH3NH3PbI3 encountered restrictions due to toxicity and instability of the lead element. Recently, studies on properties of lead-free and mixture of lead with other cations perovskite thin films as light absorber materials have been reported. The purpose of this paper was the fabrication of CH3NH3Sn1-xPbxI3 thin films with different SnI2 concentrations in ambient condition, and study on the structural, morphological, optical, and photovoltaic performance of the studied solar cells. The X-ray diffraction studies revealed the formation of both CH3NH3PbI3 and CH3NH3SnI3 phases with increasing the Sn concentration, and improvement in crystallinity and morphology was also observed. All perovskite layers had a relatively high absorption coefficient >104 cm−1 in the visible wavelengths, and the bandgap values varied in the range from 1.46 to 1.63 eV. Perovskite solar cells based on these thin films have been fabricated, and device performance was investigated. Results showed that photo-conversion efficiency (PCE) for the pure CH3NH3PbI3sample was 1.20%. With adding SnI2, PCE was increased to 4.48%. Design/methodology/approach In this work, the author mixed tin and lead with different percentages in the perovskite thin film. Also, the preparation of these layers and also other layers to fabricate solar cells based on them were conducted in an open and non-glove box environment. Finally, the effect of [Sn/Pb] ratio in the CH3NH3Sn1-xPbxI3 layers on the structural, morphological, optical, electrical and photovoltaic performance have been investigated. Findings CH3NH3Sn1-xPbxI3 (x = 0.0, 0.25, 0.50, 0.75, 1.0) perovskite thin films have been grown by a spin-coating technique. It was found that as tin concentration increases, the X-ray diffraction and FESEM images studies revealed the formation of both CH3NH3PbI3 and CH3NH3SnI3 phases, and improvement in crystallinity, and morphology; all thin films had high absorption coefficient values close to 104 cm−1 in the visible region, and the direct optical bandgap in the layers decreases from 1.63 eV in pure CH3NH3SnI3 to 1.46 eV for CH3NH3Sn0.0.25Pb0.75I3 samples; all thin films had p-type conductivity, and mobility and carrier density increased; perovskite solar cells based on these thin films have been fabricated, and device performance was investigated. Results showed that photo-conversion efficiency (PCE) for the pure CH3NH3PbI3sample was 1.20%. With adding SnI2, PCE was increased to 4.48%. Originality/value The preparation method seems to be interesting as it is in an ambient environment without the protection of nitrogen or argon gas.

scholarly journals Triple-cation low-bandgap perovskite thin-films for high-efficiency four-terminal all-perovskite tandem solar cells

2020 ◽  
Vol 8 (46) ◽  
pp. 24608-24619 ◽  
Author(s):  
Somayeh Moghadamzadeh ◽  
Ihteaz M. Hossain ◽  
The Duong ◽  
Saba Gharibzadeh ◽  
Tobias Abzieher ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
High Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Tandem Solar Cells ◽  
Low Bandgap ◽  
Photo Stability

Incorporating 2.5% Cs in FA0.8MA0.2Sn0.5Pb0.5I3 improves the photo-stability of the low-bandgap perovskite solar cells. The champion device with power conversion efficiency of 18.9% maintain 92% of its initial efficiency after 120 min MPP tracking.

A thiourea additive-based quadruple cation lead halide perovskite with an ultra-large grain size for efficient perovskite solar cells

Nanoscale ◽  
2019 ◽  
Vol 11 (45) ◽  
pp. 21824-21833 ◽  
Author(s):  
Jyoti V. Patil ◽  
Sawanta S. Mali ◽  
Chang Kook Hong
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Inorganic Perovskite ◽  
Halide Perovskite ◽  
Lead Halide

Controlling the grain size of the organic–inorganic perovskite thin films using thiourea additives now crossing 2 μm size with >20% power conversion efficiency.

Control by Mixed-Chloride Additives of the Quality and Homogeneity of Bulk Halide Perovskite upon Film Formation Process

2021 ◽  
Author(s):  
Thierry Pauporté ◽  
Daming zheng
Keyword(s):  
Solar Cells ◽  
Formation Process ◽  
High Efficiency ◽  
Film Formation ◽  
Perovskite Solar Cells ◽  
X Ray Diffraction ◽  
X Ray ◽  
Stability Issue ◽  
Halide Perovskite ◽  
The Stability

Nowadays, overcoming the stability issue of perovskite solar cells (PSCs) while keeping high efficiency has become an urgent need for the future of this technology. By using x-ray diffraction (XRD),...

Fabrication of lead-free CsBi3I10 based compact perovskite thin films by employing solvent engineering and anti-solvent treatment techniques: an efficient photo-conversion efficiency up to 740 nm

2020 ◽  
Vol 4 (10) ◽  
pp. 5042-5049
Author(s):  
Pandiyarajan Mariyappan ◽  
Towhid H. Chowdhury ◽  
Shanthi Subashchandran ◽  
Idriss Bedja ◽  
Hamid M. Ghaithan ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Conversion Efficiency ◽  
Perovskite Solar Cells ◽  
Lead Free ◽  
Solvent Treatment ◽  
Solvent Engineering ◽  
Treatment Techniques

Lead free CsBi3I10 based thin films has been developed for perovskite solar cells by introducing antisolvent method with photo conversion efficiency up to 740 nm.

scholarly journals A Review on Improving the Quality of Perovskite Films in Perovskite Solar Cells via the Weak Forces Induced by Additives

2019 ◽  
Vol 9 (20) ◽  
pp. 4393 ◽  
Author(s):  
Jien Yang ◽  
Songhua Chen ◽  
Jinjin Xu ◽  
Qiong Zhang ◽  
Hairui Liu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
High Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Term Stability ◽  
Long Term Stability ◽  
Weak Forces

Perovskite solar cells (PSCs) employing organic-inorganic halide perovskite as active layers have attracted the interesting of many scientists since 2009. The power conversion efficiency (PCE) have pushed certified 25.2% in 2019 from initial 3.81% in 2009, which is much faster than that of any type of solar cell. In the process of optimization, many innovative approaches to improve the morphology of perovskite films were developed, aiming at elevate the power conversion efficiency of perovskite solar cells (PSCs) as well as long-term stability. In the context of PSCs research, the perovskite precursor solutions modified with different additives have been extensively studied, with remarkable progress in improving the whole performance. In this comprehensive review, we focus on the forces induced by additives between the cations and anions of perovskite precursor, such as hydrogen bonds, coordination or some by-product (e.g., mesophase), which will lead to form intermediate adduct phases and then can be converted into high quality films. A compact uniform perovskite films can not only upgrade the power conversion efficiency (PCE) of devices but also improve the stability of PSCs under ambient conditions. Therefore, strategies for the implementation of additives engineering in perovskites precursor solution will be critical for the future development of PSCs. How to manipulate the weak forces in the fabrication of perovskite film could help to further develop high-efficiency solar cells with long-term stability and enable the potential of future practical applications.

Enhancing the Efficiency of Dye Sensitized Solar Cells by Using Anatase and Brookite Mixed Phases of TiO2

2019 ◽  
Vol 14 (11) ◽  
pp. 1582-1588 ◽  
Author(s):  
M. I. Khan ◽  
Shahnawaz ◽  
Shahid Imran ◽  
Muhammad Waqas Yousaf ◽  
A. Wahab ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Anatase Phase ◽  
Sol Gel ◽  
Dye Sensitized Solar Cells ◽  
Visible Region ◽  
Mixed Phase ◽  
Solar Simulator ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

The phases of TiO2 have an important role in the efficiency of dye sensitized solar cells (DSSCs). In this research, the effects of anatase and mixed phases (brookite and anatase) of TiO2 on the efficiency of DSSCs have been reported. 2% Cu doped TiO2 (Cu:TiO2) thin films are prepared by sol–gel dip coating technique. These films are annealed at the temperatures of "350 °C, 450 °C, 550 °C and 650 °C." XRD showed that at 550 °C and 650 °C, films have mixed phases of TiO2. Also, it showed that grain size is increased by increasing temperature. No extra phases of Cu like CuO etc. were observed in XRD graphs, which confirmed that Cu is completely dissolved into TiO2. UV-Vis results showed that all the films have more than 80% transmittance in the visible region. The optical band gap energy (Eg) of films at "350 °C, 450 °C, 550 °C and 650 °C" is 3.96, 3.81, 3.75 and 3.64 eV, respectively. The electrical resistivity of these thin films by four point probe technique is calculated as 121.8 × 102 Ω-m, 95.69 × 102 Ω-m, 86.65 × 102 Ω-m and 76.3 × 102Ω-m respectively. Solar simulator results showed that the current density (Jsc) of mixed phase is higher than single phase, causing higher efficiency. The maximum Jsc 5.12 mAcm–2 is achieved at 650 °C (mixed phase), resulting in higher efficiency of 2.35% which is more than 100 times the efficiency of anatase phase which has 1.18%. This work will provide a way to enhance the efficiency of DSSCs by using mixed phases of TiO2. In future, if 1-D structure of these mixed phases is used in DSSCs then efficiency of DSSCs will improve definitely (or positively).

Growth control of compact CH3NH3PbI3 thin films via enhanced solid-state precursor reaction for efficient planar perovskite solar cells

2015 ◽  
Vol 3 (17) ◽  
pp. 9249-9256 ◽  
Author(s):  
Yuanyuan Zhou ◽  
Mengjin Yang ◽  
Alexander L. Vasiliev ◽  
Hector F. Garces ◽  
Yixin Zhao ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Solid State ◽  
High Efficiency ◽  
Perovskite Solar Cells ◽  
Growth Control ◽  
Processing Method ◽  
Solution Processing

A new solution-processing method is demonstrated for the deposition of compact CH3NH3PbI3 perovskite thin films for high-efficiency planar solar cells.

scholarly journals Enhancement of photovoltage by electronic structure evolution in multiferroic Mn-doped BiFeO3 thin films

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Seiji Nakashima ◽  
Tohru Higuchi ◽  
Akira Yasui ◽  
Toyohiko Kinoshita ◽  
Masaru Shimizu ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Photovoltaic Effect ◽  
Ferroelectric Materials ◽  
Voltage Source ◽  
Structure Evolution ◽  
X Ray ◽  
Converse Piezoelectric Effect

Abstract The bulk photovoltaic effect (BPVE) is a mechanism of recent focus for novel solar cells that exceed the power conversion efficiency of p–n junction solar cells because of the quantum mechanical effect to generate photocurrent known as shift current. Ferroelectrics are receiving attention again because of their high voltage generation by the BPVE and converse piezoelectric effect to realize high performance optical actuators. We have investigated the BPVE in ferroelectric BiFeO3 (BFO) single crystal thin films, whereby the photovoltage was enhanced by Mn doping, and 852 V generation was demonstrated at 80 K. The enhancement mechanism was also investigated using soft and hard X-ray photoelectron spectroscopy (SXPES, HAXPES), and soft X-ray absorption spectroscopy with synchrotron radiation. This report reveals a way to new voltage source applications employing the BPVE for high impedance devices with ferroelectrics. Important aspects for designing ferroelectric materials by impurity doping are also discussed.

Atomic Layer Deposited Electron Transport Layers in Efficient Organometallic Halide Perovskite Devices

MRS Advances ◽  
2018 ◽  
Vol 3 (51) ◽  
pp. 3075-3084 ◽  
Author(s):  
Melissa M. McCarthy ◽  
Arnaud Walter ◽  
Soo-Jin Moon ◽  
Nakita K. Noel ◽  
Shane O’Brien ◽  
...  
Keyword(s):  
Thin Films ◽  
Electron Transport ◽  
Photoelectron Spectroscopy ◽  
Growth Parameters ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Atomic Layer ◽  
X Ray ◽  
Layer Deposition ◽  
Halide Perovskite

ABSTRACTAmorphous TiO2 and SnO2 electron transport layers (ETLs) were deposited by low-temperature atomic layer deposition (ALD). Surface morphology and x-ray photoelectron spectroscopy (XPS) indicate uniform and pinhole free coverage of these ALD hole blocking layers. Both mesoporous and planar perovskite solar cells were fabricated based on these thin films with aperture areas of 1.04 cm2 for TiO2 and 0.09 cm2 and 0.70 cm2 for SnO2. The resulting cell performance of 18.3 % power conversion efficiency (PCE) using planar SnO2 on 0.09 cm2 and 15.3 % PCE using mesoporous TiO2 on 1.04 cm2 active areas are discussed in conjunction with the significance of growth parameters and ETL composition.

Sign in / Sign up

Export Citation Format

Share Document