High-performance carbon-based CsPbI2Br perovskite solar cells via small molecule modification
High-performance carbon-based CsPbI2Br perovskite solar cells via small molecule modification
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DOI：
10.1016/j.jpowsour.2021.230676
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发表时间：
2021-12
影响因子：
9.2
通讯作者：
Qianji Han;Fengyang Yu;Liangle Wang;Shuzhang Yang;Xiaoyong Cai;Xianhe Meng;Okuzono Yūta;Kitamura Tak
中科院分区：
文献类型：
--
作者：
Qianji Han;Fengyang Yu;Liangle Wang;Shuzhang Yang;Xiaoyong Cai;Xianhe Meng;Okuzono Yūta;Kitamura Tak
全无机CsPbI2Br钙钛矿材料因其优异的热稳定性和合适的带隙而在高性能光伏领域引起了极大的关注。此外，碳基CsPbI2Br钙钛矿太阳能电池（C-PSC）不仅进一步提高了器件的热稳定性和湿度稳定性，而且还降低了生产成本并简化了工艺流程。然而，碳电极的使用带来了新的问题，例如界面接触不良和能级不匹配。本文将带有S原子的N-苯基硫脲（PTU）和带有O原子的N-苯基脲（PU）应用于C-PSC中的界面改性材料。原子 S 和 O 可以与 Pb 结合，增强钙钛矿结晶度并控制能级。同时，PTU和PU钝化后，钙钛矿层的缺陷态密度显着降低，从而抑制了载流子的复合。具有 PTU 的器件的 Voc 从 1.12 V 增加到 1.22 V，比对照器件提高了 9%。修饰后CsPbI2Br C-PSCs的效率从10.29%提高到13.01%。此外，设备的稳定性也得到了提高。本研究为开发高效、稳定的 C-PSC 提供了策略。
All-inorganic CsPbI2Br perovskite material has attracted enormous attention for high-performance photovoltaics due to its excellent thermal stability and suitable bandgap. Furthermore, carbon-based CsPbI2Br perovskite solar cells (C-PSCs) not only further improve the thermal and moisture stability of the devices but also reduce production costs and simplify procedure processes. However, the usage of carbon electrodes introduces new problems, such as poor interface contact and energy level mismatch. Herein, the N-phenylthiourea (PTU) with S atom and N-phenylurea (PU) with O atom are applied for interface modification materials in C-PSCs. The atoms S and O can combine with Pb and enhance perovskite crystallinity as well as manage the energy level. Meanwhile, after passivation of PTU and PU, the defect state density of the perovskite layer is significantly reduced, thereby inhibiting the recombination of carriers. TheVocof the device with PTU increases from 1.12 V to 1.22 V, 9% improvement over the control device. The efficiency of CsPbI2Br C-PSCs is improved from 10.29% to 13.01% after modification. Furthermore, the stability of the device has been improved. This study provides a strategy for developing highly efficient and stable C-PSCs.