Universal Bottom Contact Modification with Diverse 2D Spacers for High‐Performance Inverted Perovskite Solar Cells

Defects, inevitably produced in the solution-processed halide perovskite films, can act as charge carrier recombination centers to induce severe energy loss in perovskite solar cells (PSCs). Suppressing these trap states...

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Stiffening the Pb-X Framework through a π-Conjugated Small-Molecule Cross-Linker for High-Performance Inorganic CsPbI2Br Perovskite Solar Cells

ACS Applied Materials & Interfaces ◽

10.1021/acsami.1c06533 ◽

2021 ◽

Author(s):

Hui Li ◽

Xiaotao Hao ◽

Bohong Chang ◽

Zihao Li ◽

Lian Wang ◽

...

Keyword(s):

Solar Cells ◽

Small Molecule ◽

High Performance ◽

Perovskite Solar Cells ◽

Cross Linker

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Iodine reduction for reproducible and high-performance perovskite solar cells and modules

Science Advances ◽

10.1126/sciadv.abe8130 ◽

2021 ◽

Vol 7 (10) ◽

pp. eabe8130

Author(s):

Shangshang Chen ◽

Xun Xiao ◽

Hangyu Gu ◽

Jinsong Huang

Keyword(s):

Solar Cells ◽

High Performance ◽

High Efficiency ◽

Electronic Materials ◽

Substantial Reduction ◽

Perovskite Solar Cells ◽

High Yield ◽

Operation Conditions ◽

Record Value ◽

Precursor Powders

Perovskite-based electronic materials and devices such as perovskite solar cells (PSCs) have notoriously bad reproducibility, which greatly impedes both fundamental understanding of their intrinsic properties and real-world applications. Here, we report that organic iodide perovskite precursors can be oxidized to I2 even for carefully sealed precursor powders or solutions, which markedly deteriorates the performance and reproducibility of PSCs. Adding benzylhydrazine hydrochloride (BHC) as a reductant into degraded precursor solutions can effectively reduce the detrimental I2 back to I−, accompanied by a substantial reduction of I3−-induced charge traps in the films. BHC residuals in perovskite films further stabilize the PSCs under operation conditions. BHC improves the stabilized efficiency of the blade-coated p-i-n structure PSCs to a record value of 23.2% (22.62 ± 0.40% certified by National Renewable Energy Laboratory), and the high-efficiency devices have a very high yield. A stabilized aperture efficiency of 18.2% is also achieved on a 35.8-cm2 mini-module.

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Room-Temperature Solution-Processed 0D/1D Bilayer Electrodes for Translucent CsPbBr3 Perovskite Photovoltaics

Nanomaterials ◽

10.3390/nano11061489 ◽

2021 ◽

Vol 11 (6) ◽

pp. 1489

Author(s):

Bhaskar Parida ◽

Saemon Yoon ◽

Dong-Won Kang

Keyword(s):

Solar Cells ◽

Indium Tin Oxide ◽

High Performance ◽

Room Temperature ◽

Low Cost ◽

Perovskite Solar Cells ◽

Ambient Air ◽

Plasma Damage ◽

Temperature Solution ◽

Ito Nanoparticles

Materials and processing of transparent electrodes (TEs) are key factors to creating high-performance translucent perovskite solar cells. To date, sputtered indium tin oxide (ITO) has been a general option for a rear TE of translucent solar cells. However, it requires a rather high cost due to vacuum process and also typically causes plasma damage to the underlying layer. Therefore, we introduced TE based on ITO nanoparticles (ITO-NPs) by solution processing in ambient air without any heat treatment. As it reveals insufficient conductivity, Ag nanowires (Ag-NWs) are additionally coated. The ITO-NPs/Ag-NW (0D/1D) bilayer TE exhibits a better figure of merit than sputtered ITO. After constructing CsPbBr3 perovskite solar cells, the device with 0D/1D TE offers similar average visible transmission with the cells with sputtered ITO. More interestingly, the power conversion efficiency of 0D/1D TE device was 5.64%, which outperforms the cell (4.14%) made with sputtered-ITO. These impressive findings could open up a new pathway for the development of low-cost, translucent solar cells with quick processing under ambient air at room temperature.

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