Different types of hybrid organic/inorganic halide perovskite solar cells (PSCs) have attracted extensive research attention and have shown extremely promising potential for practical applications in the current energy field. For example, wide bandgap (WBG) PSCs are widely used Fabricating high-efficiency tandem devices Inorganic perovskite solar cells (IPSCs) are sought after by researchers because of their excellent thermal stability. However, both WBG PSC or IPSC are severely affected by carrier extraction and transport between the electron transport layer and the anode/cathode.
Zhang Xiaodan and Qian Huang of Nankai University used in-situ oxygen plasma treated Ti-doped ZnO thin film TZO(O) as the cathode buffer layer to adjust the energy level arrangement between the SnO2 layer and the ITO electrode, optimize the quality of the perovskite crystal and Passivated perovskite. Eliminate defects by providing high-quality SnO2 films.
The study found that a more suitable interlayer energy level can improve the carrier transport effect to a great extent, which can be seen in the steady-state and time-resolved photoluminescence spectra. In addition, the perovskite covered on TZO The mineral film (O)/SnO2 exhibits larger perovskite crystals and fewer surface defects.
As a result, the power conversion efficiency (PCE) of the optimized device with a band gap of about 1.66 eV is as high as 21.62%, and the efficiency of CsPbI2.85Br0.15 IPSC is increased from 19.21% to 20.92%. Furthermore, the unencapsulated TZO(O)-processed wide-bandgap PSC exhibited enhanced stability, retaining 89.47% of its initial efficiency after 1000 hours in an N2-filled environment, while the unencapsulated IPSC-based TZO(O) Maintains 83.77% of its initial efficiency for 325 hours of continuous lighting in air. This work demonstrates that buffer layer TZO(O) is a promising nip-type wide bandgap PSC interface modification material.
Ming Luo, Sanlong Wang, Zhao Zhu, Biao Shi, Pengyang Wang, Guofu Hou, Qian Huang, Ying Zhao, Xiaodan Zhang, Novel Cathode Buffer Layer Enabling over 21.6%/20.9% Efficiency in wide bandgap/inorganic Perovskite Solar Cells
https://doi.org/10.1016/j.nanoen.2023.109162
https://www.sciencedirect.com/science/article/pii/S2211285523009990#