Wang Hanyu, Ouyang Yukun, Zou Wenjing, Liu Xingchong, Li Haimin, Zhou Ruonan, Peng Xian, Gong Xiaoli
School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China.
ACS Appl Mater Interfaces. 2021 Dec 15;13(49):58458-58466. doi: 10.1021/acsami.1c13784. Epub 2021 Dec 6.
Perovskite defect passivation with molecule doping shows great potential in boosting the efficiency and stability of perovskite solar cells (PSCs). Herein, an efficient and low-cost bifunctional Lewis base additive d-tryptophan is introduced to control the crystallization and growth of perovskite grains and passivation defects. It is found that the additive doped in the solution precursors could retard crystal growth by increasing activation energy, resulting in improved crystallization of large grains with reduced grain boundaries, as well as inhibiting ion migration and PbI aggregation. As a result, the PSCs incorporated with d-tryptophan additives achieve an improved power conversion efficiency from 18.18 to 21.55%. Moreover, the d-tryptophan passivation agent improves the device stability, which retains 86.85% of its initial efficiency under ambient conditions at room temperature after 500 h. This work provides Lewis base small-molecule d-tryptophan for efficient defect passivation of the grain boundaries toward efficient and stable PSCs.
通过分子掺杂进行钙钛矿缺陷钝化在提高钙钛矿太阳能电池（PSC）的效率和稳定性方面显示出巨大潜力。在此，引入了一种高效且低成本的双功能路易斯碱添加剂d-色氨酸，以控制钙钛矿晶粒的结晶和生长并钝化缺陷。研究发现，掺杂在溶液前驱体中的添加剂可通过增加活化能来延缓晶体生长，从而改善大晶粒的结晶，减少晶界，同时抑制离子迁移和PbI聚集。结果，掺入d-色氨酸添加剂的PSC的功率转换效率从18.18%提高到了21.55%。此外，d-色氨酸钝化剂提高了器件稳定性，在室温环境条件下500小时后仍保留其初始效率的86.85%。这项工作为高效稳定的PSC的晶界提供了用于有效缺陷钝化的路易斯碱小分子d-色氨酸。
