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Defect Passivation by Pyridine-Carbazole Molecules for Efficient and Stable Perovskite Solar Cells
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2022-12-14 , DOI: 10.1021/acsaem.2c03364
Ganbaatar Tumen-Ulzii 1, 2, 3 , Morgan Auffray 1 , Dino Klotz 2 , George F. Harrington 2 , Xian-Kai Chen 1 , Umamahesh Balijapalli 1 , Veeramani Vediyappan 2 , Nozomi Nakamura 1 , Zhao Feng 1 , Kotaro Takekuma 1 , Yuki Fujita 1 , Pangpang Wang 4 , Sunao Yamada 4 , Kaoru Tamada 5 , Munkhbayar Batmunkh 6 , Yu Lin Zhong 6 , Fabrice Mathevet 1, 7 , Hayden Salway 3 , Miguel Anaya 3, 8 , Samuel D. Stranks 3, 8 , Toshinori Matsushima 2 , Chihaya Adachi 1, 2, 4
Affiliation  

The defects in the light-harvesting perovskite absorber layer play a key role in limiting power conversion efficiencies (PCEs) and long-term stability of lead halide perovskite solar cells (PSCs). Although organic ammonium halides have been used for defect passivation in high-performance PSCs, the stability issue is still a challenge. Herein, we develop a novel material of pyridine-carbazole (Py-Cz) to passivate defects via coordination bonding. With this passivation, the photoluminescence intensity of perovskite films was increased. In addition, the formation of under-coordinated Pb2+ defects in perovskite films was reduced significantly, enabling high-performance and long-term stable PSCs. Three different sets of PSCs were constructed, namely, without passivation, with phenethylammonium iodide (PEAI) (commonly used for passivation), and with Py-Cz passivation. Remarkably, the PSCs fabricated using the Py-Cz passivation not only achieved PCEs of over 20% but also retained 85% of their initial performances over more than 5000 h. In contrast, the PSCs without or with PEAI passivation degraded quickly during the long-term operational stability test under light illumination. This method opens up a new opportunity to develop highly efficient and operationally stable PSCs.

中文翻译:

吡啶-咔唑分子的缺陷钝化用于高效稳定的钙钛矿太阳能电池

光捕获钙钛矿吸收层中的缺陷在限制功率转换效率 (PCE) 和卤化铅钙钛矿太阳能电池 (PSC) 的长期稳定性方面起着关键作用。尽管有机卤化铵已被用于高性能 PSC 的缺陷钝化,但稳定性问题仍然是一个挑战。在此,我们开发了一种新型吡啶-咔唑 (Py-Cz) 材料,通过配位键钝化缺陷。通过这种钝化,钙钛矿薄膜的光致发光强度增加。此外,配位不足的 Pb 2+的形成钙钛矿薄膜中的缺陷显着减少,从而实现高性能和长期稳定的 PSC。构建了三组不同的 PSC,即未钝化、苯乙基碘化铵 (PEAI)(常用于钝化)和 Py-Cz 钝化。值得注意的是,使用 Py-Cz 钝化法制造的 PSC 不仅实现了超过 20% 的 PCE,而且在超过 5000 小时后仍保留了其初始性能的 85%。相比之下,没有或有 PEAI 钝化的 PSC 在光照下的长期运行稳定性测试中会迅速退化。这种方法为开发高效且运行稳定的 PSC 开辟了新的机会。
更新日期:2022-12-14
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