Buried Modification with Tetramethylammonium Chloride to Enhance the Performance of Perovskite Solar Cells with n-i-p Structure
Buried Modification with Tetramethylammonium Chloride to Enhance the Performance of Perovskite Solar Cells with n-i-p Structure
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DOI：
10.1016/j.cej.2023.143652
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发表时间：
2023-05
影响因子：
15.1
通讯作者：
Pengxu Chen;Weichun Pan;Sijia Zhu;Fengxian Cao;Anling Tong;Ruowei He;Z. Lan;Weihai Sun;Jihuai Wu
中科院分区：
文献类型：
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作者：
Pengxu Chen;Weichun Pan;Sijia Zhu;Fengxian Cao;Anling Tong;Ruowei He;Z. Lan;Weihai Sun;Jihuai Wu
钙钛矿太阳能电池（PSCs）的电子传输层（ETL）和钙钛矿（PVK）层的固有缺陷以及PVK和钙钛矿（PVK）层之间的能级不匹配严重限制了器件性能。在这里，我们引入了一种多功能分子（四甲基氯化铵，TMACl）作为SnO2ETL的钝化剂。在退火处理过程中，通过钝化SnO2表面的氧空位来抑制SnO2ETL中的缺陷。此外，TMACl的存在使得PVK在退火过程中不可避免产生的缺陷能够被迁移的TMA+阳离子和Cl−阴离子有效地钝化。表征结果进一步证实，与体掺杂相比，TMACl的表面改性更有利于抑制PVK的界面复合和体晶界缺陷的钝化。值得注意的是，与原始器件（21.02%）相比，基于tmacl掺杂的sno2和tmacl修饰的sno2etl器件分别获得了22.71%和23.08%的优越冠军效率。更重要的是，基于TMACl修饰的sno2的未封装PSCs在相对湿度为20-30%的湿度控制室中储存了35天，保持了88%的原始效率，这表明使用TMACl盐钝化SnO2ETL是实现高光伏性能的有效且有前途的方法。
Intrinsic defects in the electron transport layer (ETL) and perovskite (PVK) layer, as well as energy level mismatch between the PVK and ETL, severely limit the device performance of perovskite solar cells (PSCs). Here, we introduced a multifunctional molecule (tetramethylammonium chloride, TMACl) as a passivator in the SnO2ETL. During the annealing treatment, the defects in SnO2ETL are suppressed by passivating the oxygen vacancies on the surface of SnO2. Moreover, the presence of TMACl enables the defects inevitably generated during the annealing process of PVK to be effectively passivated by the migrating TMA+cations and Cl−anions. The characterization results further confirm that the surface modification of TMACl is more favorable for the suppression of interfacial recombination and the passivation of bulk and grain boundary defects of PVK compared to the bulk doping method. It is noteworthy that, compared with the pristine device (21.02%), the devices based on TMACl-doped SnO2and TMACl-modified SnO2ETLs obtained superior champion efficiencies of 22.71% and 23.08%, respectively. More importantly, the unencapsulated PSCs based on TMACl-modified SnO2maintained 88% of their original efficiency during 35 days of storage in a humidity-controlled chamber with a relative humidity of 20–30%, demonstrating the passivation of SnO2ETL using TMACl salts is an effective and promising approach to achieving high photovoltaic performances of PSCs.