Potassium iodide reduces the stability of triple-cation perovskite solar cells.
Potassium iodide reduces the stability of triple-cation perovskite solar cells.
复制标题
作者：
在杂化钙钛矿材料中添加碱金属卤化物会显着影响其结晶，从而影响其在太阳能电池器件中使用时的性能。先前关于在有源层中使用碘化钾（KI）来钝化三阳离子混合卤化物钙钛矿中的缺陷的研究已被证明可以提高其发光效率并减少电流-电压滞后。然而，KI 钝化钙钛矿太阳能电池在环境条件下的运行稳定性在很大程度上仍未得到探索。通过研究具有 SnO2 或 TiO2 电子传输层 (ETL) 的钙钛矿太阳能电池性能，我们提出使用 KI 进行缺陷钝化对钙钛矿-ETL 界面的成分高度敏感。我们再次证实了之前报告的发现，即 KI 优先与混合卤化物钙钛矿中的溴离子相互作用，并且在前驱体溶液中浓度 >5 mol% 时，改变了主要吸收剂的组成，并导致在高 KI 浓度下出现不需要的次生非钙钛矿相 (KBr) 的相分离。重要的是，通过研究环境/高湿度条件下连续照明和偏压下材料和器件的稳定性，我们表明这种第二相成为有利的降解产物，并且包含 KI 的器件稳定性降低。在杂化钙钛矿材料中添加碱金属卤化物会显着影响其结晶，从而影响其在太阳能电池器件中使用时的性能。
The addition of alkali metal halides to hybrid perovskite materials can significantly impact their crystallisation and hence their performance when used in solar cell devices. Previous work on the use of potassium iodide (KI) in active layers to passivate defects in triple-cation mixed-halide perovskites has been shown to enhance their luminescence efficiency and reduce current–voltage hysteresis. However, the operational stability of KI passivated perovskite solar cells under ambient conditions remains largely unexplored. By investigating perovskite solar cell performance with SnO2 or TiO2 electron transport layers (ETL), we propose that defect passivation using KI is highly sensitive to the composition of the perovskite–ETL interface. We reconfirm findings from previous reports that KI preferentially interacts with bromide ions in mixed-halide perovskites, and – at concentrations >5 mol% in the precursor solution – modifies the primary absorber composition as well as leading to the phase segregation of an undesirable secondary non-perovskite phase (KBr) at high KI concentration. Importantly, by studying both material and device stability under continuous illumination and bias under ambient/high-humidity conditions, we show that this secondary phase becomes a favourable degradation product, and that devices incorporating KI have reduced stability. The addition of alkali metal halides to hybrid perovskite materials can significantly impact their crystallisation and hence their performance when used in solar cell devices.
登录
查看更多内容
影响因子：
22
作者：
Gratia, Paul;Zimmermann, Iwan;Nazeeruddin, Mohammad Khaja
通讯作者：
Nazeeruddin, Mohammad Khaja
影响因子：
8.6
作者：
Philippe, Bertrand;Saliba, Michael;Rensmo, Hakan
通讯作者：
Rensmo, Hakan
影响因子：
5.7
作者：
De Wolf, Stefaan;Holovsky, Jakub;Ballif, Christophe
通讯作者：
Ballif, Christophe
影响因子：
15
作者：
Kubicki DJ;Prochowicz D;Hofstetter A;Zakeeruddin SM;Grätzel M;Emsley L
通讯作者：
Emsley L
使用 SnO2 增强电子提取，用于高效平面结构 HC(NH2)(2)PbI3 基钙钛矿太阳能电池
影响因子：
56.7
作者：
Jiang, Qi;Zhang, Liuqi;You, Jingbi
通讯作者：
You, Jingbi