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Synergetic Regulation of Interface Defects and Carriers Dynamics for High-Performance Lead-Free Perovskite Solar Cells.

SMALL(2024)SCI 2区

South China Univ Technol | Dongguan Univ Technol

Cited 15|Views21
Abstract
Severe nonradiative recombination and open-circuit voltage loss triggered by high-density interface defects greatly restrict the continuous improvement of Sn-based perovskite solar cells (Sn-PVSCs). Herein, a novel amphoteric semiconductor, O-pivaloylhydroxylammonium trifluoromethanesulfonate (PHAAT), is developed to manage interface defects and carrier dynamics of Sn-PVSCs. The amphiphilic ionic modulators containing multiple Lewis-base functional groups can synergistically passivate anionic and cationic defects while coordinating with uncoordinated Sn2+ to compensate for surface charge and alleviate the Sn2+ oxidation. Especially, the sulfonate anions raise the energy barrier of surface oxidation, relieve lattice distortion, and inhibit nonradiative recombination by passivating Sn-related and I-related deep-level defects. Furthermore, the strong coupling between PHAAT and Sn perovskite induces the transition of the surface electronic state from p-type to n-type, thus creating an extra back-surface field to accelerate electron extraction. Consequently, the PHAAT-treated device exhibits a champion efficiency of 13.94% with negligible hysteresis. The device without any encapsulation maintains 94.7% of its initial PCE after 2000 h of storage and 91.6% of its initial PCE after 1000 h of continuous illumination. This work provides a reliable strategy to passivate interface defects and construct p-n homojunction to realize efficient and stable Sn-based perovskite photovoltaic devices.
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deep-level trap states,interface carrier management,lead-free perovskite solar cells,nonradiative recombination loss
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要点】:研究开发了一种两性半导体PHAAT,有效管理Sn基钙钛矿太阳能电池的界面缺陷和载流子动力学,实现了高效稳定的太阳能电池性能。

方法】:使用PHAAT这种含有多个路易斯碱功能团的 amphiphilic ionic modulators,对Sn基钙钛矿太阳能电池的界面缺陷进行协同钝化,并调整表面电荷,缓解Sn2+氧化。

实验】:通过实验,PHAAT处理后的设备展现出13.94%的最高效率,且无明显的滞后现象,同时在无封装条件下,2000小时存储后保持初始光电转换效率的94.7%,1000小时连续照射后保持初始效率的91.6%。实验使用的数据集为Sn基钙钛矿太阳能电池的性能数据。