Journal of Inorganic Materials ›› 2021, Vol. 36 ›› Issue (6): 629-636.DOI: 10.15541/jim20200495

Special Issue: 能源材料论文精选(2021) 【虚拟专辑】钙钛矿材料(2020~2021) 【虚拟专辑】太阳能电池(2020~2021) 【能源环境】钙钛矿 【能源环境】太阳能电池

• RESEARCH ARTICLE • Previous Articles     Next Articles

Passiviation of L-3-(4-Pyridyl)-alanine on Interfacial Defects of Perovskite Solar Cell

LIU Wenwen1(), HU Zhilei1, WANG Li1, CAO Mengsha1, ZHANG Jing1, ZHANG Jing1, ZHANG Shuai1(), YUAN Ningyi1, DING Jianning2()   

  1. 1. School of Materials Science and Engineering, Jiangsu Photovoltaic Science and Engineering Collaborative Innovation Center, Changzhou university, Changzhou 213164, China
    2. Micro Center for Science and Technology, Jiangsu University, Zhenjiang 212013, China
  • Received:2020-08-27 Revised:2020-10-22 Published:2021-06-20 Online:2020-11-05
  • Contact: ZHANG Shuai, associate professor. E-mail: shuaizhang@cczu.edu.cn; DING Jianning, professor. E-mail: dingjn@cczu.edu.cn
  • About author:LIU Wenwen(1997-), female, Master candidate. E-mail: 2356143925@qq.com
  • Supported by:
    National Natural Science Foundation of China(51602031);National Natural Science Foundation of China(51603021);The Qinlan Project(2019);Natural Science Foundation of the Jiangsu Higher Education Institutions(19KJA430014);Postgraduate Research & Practice Innovation Program of Jangsu Province(SJCX20_0975)

Abstract:

In recent years, perovskite materials become a research hotspot in the field of solar cells due to their excellent photovoltaic properties, but control of their interface defects still remains one of the key problems to be solved. In this study, an organic small molecule additive (L-3-(4-pyridyl)-alanine (PLA)) was introduced in the preparation of perovskite photoabsorption layer by two-step solution method. The characterizations showed that the introduction of PLA could comprehensively improve photoelectric performance of the device, with optimal energy conversion efficiency of 21.53%, in contrast to that of the reference device (20.10%). Further studies showed that PLA could reduce the trap state density of the device from 5.59×1016cm-3 to 3.40×1016cm-3, promote the interface charge extraction, and decrease the carrier recombination. The above improvements can be attributed to the PLA induced PbI2 enrichment at grain boundaries and PLA anchoring at defects, which play an important roles in passivate defects. This study can provide guideline for further regulating the defects of perovskite solar cells.

Key words: perovskite solar cell, additive with multifunctional groups, trap state density, carrier recombination

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