Enhancing charge-emitting shallow traps in metal halide perovskites by >100 times by surface strain

IF 38.6 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Joule Pub Date : 2024-10-25 DOI:10.1016/j.joule.2024.10.004

Ying Zhou, Hengkai Zhang, Yeming Xian, Zhifang Shi, Jean Noalick Aboa, Chengbin Fei, Guang Yang, Nengxu Li, Farida A. Selim, Yanfa Yan, Jinsong Huang

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Abstract

The low density of deep trapping defects in metal halide perovskites (MHPs) is essential for high-performance optoelectronic devices. Shallow traps in MHPs are speculated to enhance charge recombination lifetime. However, chemical nature and distribution of these shallow traps as well as their impact on solar cell operation remain unknown. Herein, we report that shallow traps are much richer in MHPs than traditional semiconductors, and their density can be enhanced by >100 times through local surface strain, indicating that shallow traps are mainly located at the surface. The surface strain is introduced by anchoring two-amine-terminated molecules onto formamidinium cations, and the shallow traps are formed by the band edge downshifting toward defect levels. The high-density shallow traps temporarily hold one type of charge and increased the concentration of the other type of free carrier in working solar cells by keeping photogenerated charges from bimolecular recombination, resulting in a reduced open-circuit voltage loss to 317 mV.

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通过表面应变将金属卤化物过氧化物中的电荷发射浅陷阱提高 >100 倍

金属卤化物过氧化物（MHPs）中的低密度深阱缺陷对高性能光电器件至关重要。据推测，MHPs 中的浅阱可提高电荷重组寿命。然而，这些浅陷阱的化学性质和分布以及它们对太阳能电池运行的影响仍然未知。在此，我们报告了 MHPs 中比传统半导体更丰富的浅陷阱，其密度可通过局部表面应变提高 100 倍，这表明浅陷阱主要位于表面。表面应变是通过将两胺端分子锚定在甲脒阳离子上而引入的，浅陷阱则是通过带边向缺陷水平下移而形成的。高密度浅陷阱可暂时保持一种类型的电荷，并通过阻止光生电荷的双分子重组来提高工作太阳能电池中另一种类型自由载流子的浓度，从而将开路电压损耗降低到 317 mV。

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来源期刊

Joule Energy-General Energy

CiteScore

53.10

自引率

2.00%

发文量

198

期刊介绍： Joule is a sister journal to Cell that focuses on research, analysis, and ideas related to sustainable energy. It aims to address the global challenge of the need for more sustainable energy solutions. Joule is a forward-looking journal that bridges disciplines and scales of energy research. It connects researchers and analysts working on scientific, technical, economic, policy, and social challenges related to sustainable energy. The journal covers a wide range of energy research, from fundamental laboratory studies on energy conversion and storage to global-level analysis. Joule aims to highlight and amplify the implications, challenges, and opportunities of novel energy research for different groups in the field.