美国西北大学Edward H. Sargent团队报道了双位点结合配体改进倒置钙钛矿太阳能电池的电荷提取。相关研究成果发表在2024年4月12日出版的国际学术期刊《科学》。

与nip PSCs相比，倒置（pin）钙钛矿太阳能电池（PSCs）提供更好的运行稳定性，但在功率转换效率（PCE）方面落后。导致pin PSCs中这种PCE缺陷的能量损失主要发生在钙钛矿和电荷传输层之间的界面处。使用钝化配体的添加剂和表面处理通常与单个活性结合位点结合，这种垂直于表面的电阻性钝化剂的密集堆积可能会限制pin PSCs中的填充因子。

研究人员鉴定了在钙钛矿上以平面配体取向，结合两个相邻的铅（II）离子（Pb²⁺）缺陷位点的配体。研究人员制造了pin PSCs，并报告了0.05cm²和1.04cm²照明区域的认证准稳态PCE分别为26.15%和24.74%。在65°C下连续1个标准阳光最大功率点运行1200小时后，设备保持95%的初始PCE。

附：英文原文

Title: Improved charge extraction in inverted perovskite solar cells with dual-site-binding ligands

Author: Hao Chen, Cheng Liu, Jian Xu, Aidan Maxwell, Wei Zhou, Yi Yang, Qilin Zhou, Abdulaziz S. R. Bati, Haoyue Wan, Zaiwei Wang, Lewei Zeng, Junke Wang, Peter Serles, Yuan Liu, Sam Teale, Yanjiang Liu, Makhsud I. Saidaminov, Muzhi Li, Nicholas Rolston, Sjoerd Hoogland, Tobin Filleter, Mercouri G. Kanatzidis, Bin Chen, Zhijun Ning, Edward H. Sargent

Issue&Volume: 2024-04-12

Abstract: Inverted (pin) perovskite solar cells (PSCs) afford improved operating stability in comparison to their nip counterparts but have lagged in power conversion efficiency (PCE). The energetic losses responsible for this PCE deficit in pin PSCs occur primarily at the interfaces between the perovskite and the charge-transport layers. Additive and surface treatments that use passivating ligands usually bind to a single active binding site: This dense packing of electrically resistive passivants perpendicular to the surface may limit the fill factor in pin PSCs. We identified ligands that bind two neighboring lead(II) ion (Pb2+) defect sites in a planar ligand orientation on the perovskite. We fabricated pin PSCs and report a certified quasi–steady state PCE of 26.15 and 24.74% for 0.05– and 1.04–square centimeter illuminated areas, respectively. The devices retain 95% of their initial PCE after 1200 hours of continuous 1 sun maximum power point operation at 65°C.

DOI: adm9474

Source: https://www.science.org/doi/10.1126/science.adm9474