Tan Jin, Dou Jie, Duan Jialong, Zhao Yuanyuan, He Benlin, Tang Qunwei
Institute of Carton Neutrality, College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China.
School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, PR China.
Dalton Trans. 2023 Mar 28;52(13):4038-4043. doi: 10.1039/d3dt00169e.
Carbon-based all-inorganic perovskite solar cells have attracted growing interest owing to their simple fabrication process, low cost, and high stability in air. On account of the large interfacial energy barriers and polycrystalline features of perovskite films, the carrier interface recombination and inherent defects in the perovskite layer are still great challenges in further increasing the power conversion efficiency and stability of carbon-based PSCs. We present here a trifunctional polyethylene oxide buffer layer at the perovskite/carbon interface to promote the PCE and stability of carbon-based all-inorganic CsPbBr PSCs: (i) the PEO layer increases the crystallinity of inorganic CsPbBr grains for low defect state density; (ii) the oxygenic groups in PEO chains passivate the defects on the perovskite surface; and (iii) the long hydrophobic alkyl chains improve the stability in moisture. The best encapsulated PSC achieves a PCE of 8.84% and maintains 84.8% of its initial efficiency in air with 80% RH over 30 days.
碳基全无机钙钛矿太阳能电池因其简单的制备工艺、低成本以及在空气中的高稳定性而受到越来越多的关注。由于钙钛矿薄膜存在较大的界面能垒和多晶特性，钙钛矿层中的载流子界面复合和固有缺陷仍是进一步提高碳基钙钛矿太阳能电池功率转换效率和稳定性的巨大挑战。我们在此展示了一种位于钙钛矿/碳界面的三功能聚环氧乙烷缓冲层，以提高碳基全无机CsPbBr钙钛矿太阳能电池的光电转换效率和稳定性：（i）PEO层提高了无机CsPbBr晶粒的结晶度，从而降低缺陷态密度；（ii）PEO链中的含氧基团钝化了钙钛矿表面的缺陷；（iii）长的疏水烷基链提高了在潮湿环境中的稳定性。封装后的最佳钙钛矿太阳能电池实现了8.84%的光电转换效率，并在相对湿度80%的空气中30天内保持其初始效率的84.8%。
