Comprehensive insights into defect passivation and charge dynamics for FA0.8MA0.15Cs0.05PbI2.8Br0.2 perovskite solar cells

Comprehensive insights into defect passivation and charge dynamics for FA0.8MA0.15Cs0.05PbI2.8Br0.2 perovskite solar cells

Nonradiative charge recombination is the main restriction on the high efficiency of organic–inorganic hybrid perovskite solar cells (PVSCs). The synergistic manipulation of the grain boundary/interface traps can control charge behavior and improve device performance. In our work, the composition of...

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Bibliographic Details
Published in:Applied physics letters Vol. 117; no. 1
Main Authors: Liu, Xiangyang, Qin, Chaoran, Liu, Xinsheng, Ding, Hengchuan, Du, Xia, Cui, Yunkang
Format: Journal Article
Language:English
Published: Melville American Institute of Physics 06-07-2020
Subjects:
Ammonium chloride
Applied physics
Crystal defects
Dynamic stability
Efficiency
Electric potential
Electron spin
Electron transport
Energy conversion efficiency
Grain boundaries
Heterostructures
Hysteresis
Perovskites
Photovoltaic cells
Solar cells
Spectrum analysis
Spin coating
Surface stability
Voltage
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Summary:Nonradiative charge recombination is the main restriction on the high efficiency of organic–inorganic hybrid perovskite solar cells (PVSCs). The synergistic manipulation of the grain boundary/interface traps can control charge behavior and improve device performance. In our work, the composition of perovskite used is FA0.8MA0.15Cs0.05PbI2.8Br0.2 (MA is methylammonium, FA is formamidinium), which produces high-performing PVSCs. A trace additive of n-butylammonium bromide (BABr) was incorporated into the perovskite precursor to passivate grain–boundary defects. The NH4Cl/KCl was spin-coated onto the electron-transport layer to modify interface contact and impede nonradiative charge recombination, inducing a high power-conversion efficiency (PCE). The highest-performing PVSCs achieved a PCE of 21.02%, a Voc of 1.13 V, a Jsc of 23.55 mA cm−2, and a FF of 0.79 under a reverse voltage scan (under a forward voltage scan the values were as follows: PCE, 20.13%; Voc, 1.12 V; Jsc, 23.65 mA cm−2; FF, 0.76), with a negligible J–V hysteresis. The hybrid 2D/3D perovskite heterostructure formed through the incorporation of BABr increased crystallinity and mitigated nonradiative recombination, resulting in reduced current-voltage hysteresis, enhanced efficiency, and significantly improved operational stability. With impedance spectroscopy and time-resolved surface photovoltage spectroscopy, the charge dynamics in PVSCs were determined.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0010705