Li Xiaomeng, Tang Yang, Song Bo, Meng Fanwen, Gao Chang, Qin Liang, Hu Yufeng, Lou Zhidong, Teng Feng, Hou Yanbing
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Beijing 100044, China.
J Phys Chem Lett. 2024 Feb 8;15(5):1355-1362. doi: 10.1021/acs.jpclett.3c03557. Epub 2024 Jan 29.
The strong Lewis acid tin halide leads to an excessively fast crystallization rate, resulting in more defects in the film and degraded device performance. In this work, a cesium acetate (CsAc) pre-buried poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole transport layer acts as nucleation points during the crystallization of tin-based perovskite, which can induce preferential orientation growth of crystals and increase the grain size to improve the quality of crystallization. The addition of CsAc not only can increase the conductivity of PEDOT:PSS but also can improve the wettability of the perovskite precursor solution to enhance the interface contact between the hole transport layer and perovskite layer. Because of the incorporation of CsAc in PEDOT:PSS, the average short-circuit current density increases from 23.80 to 27.60 mA cm. Furthermore, a power conversion efficiency of 10.99% is achieved for a tin-based perovskite solar cell with CsAc-doped PEDOT:PSS as the hole transport layer.
强路易斯酸卤化锡会导致结晶速率过快，从而使薄膜中产生更多缺陷并降低器件性能。在本工作中，醋酸铯（CsAc）预埋的聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）空穴传输层在锡基钙钛矿结晶过程中充当成核点，可诱导晶体择优取向生长并增大晶粒尺寸，从而提高结晶质量。添加CsAc不仅可以提高PEDOT:PSS的电导率，还可以改善钙钛矿前驱体溶液的润湿性，以增强空穴传输层与钙钛矿层之间的界面接触。由于在PEDOT:PSS中掺入了CsAc，平均短路电流密度从23.80增加到27.60 mA/cm²。此外，以掺有CsAc的PEDOT:PSS作为空穴传输层的锡基钙钛矿太阳能电池实现了10.99%的功率转换效率。
