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Shallow Iodine Defects Accelerate the Degradation of α-Phase Formamidinium Perovskite
Joule ( IF 38.6 ) Pub Date : 2020-09-23 , DOI: 10.1016/j.joule.2020.08.016
Shaun Tan , Ilhan Yavuz , Marc H. Weber , Tianyi Huang , Chung-Hao Chen , Rui Wang , Hao-Cheng Wang , Jeong Hoon Ko , Selbi Nuryyeva , Jingjing Xue , Yepin Zhao , Kung-Hwa Wei , Jin-Wook Lee , Yang Yang

Shallow defects are mostly benign in covalent semiconductors, such as silicon, given that they do not constitute non-radiative recombination sites. In contrast, the existence of shallow defects in ionic perovskite crystals might have significant repercussions on the long-term stability of perovskite solar cells (PSCs) because of the metastability of the ubiquitous formamidinium lead triiodide (FAPbI3) perovskite and the migration of charged point defects. Here, we show that shallow iodine interstitial defects (Ii) can be generated unintentionally during commonly used post-fabrication treatments, which can lower the cubic-to-hexagonal transformation barrier of FAPbI3-based perovskites to accelerate its phase degradation. We demonstrate that concurrently avoiding the generation of Ii and the more effective passivation of iodine vacancies (VI) can improve the thermodynamic stability of the films and operational stability of the PSCs. Our most stable PSC retained 92.1 % of its initial performance after nearly 1,000 h of continuous illumination operational stability testing.



中文翻译:

浅碘缺陷加速了α相甲ami钙钛矿的降解

浅缺陷在诸如硅之类的共价半导体中主要是良性的,因为它们不构成非辐射复合位点。相比之下,离子钙钛矿晶体中浅缺陷的存在可能对钙钛矿太阳能电池(PSC)的长期稳定性产生重大影响,这是因为普遍存在的甲碘化三碘化铅(FAPbI 3)钙钛矿的亚稳定性和带电点的迁移缺陷。在这里,我们显示出浅碘间隙缺陷(一世一世)可以在常用的后加工处理过程中无意中生成,这可以降低基于FAPbI 3的钙钛矿的立方到六方转变势垒,从而加速其相降解。我们证明了同时避免产生一世一世 以及更有效地钝化碘空位(V一世)可以改善薄膜的热力学稳定性和PSC的操作稳定性。经过近1,000小时的连续照明操作稳定性测试,我们最稳定的PSC保留了其最初性能的92.1%。

更新日期:2020-11-18
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