Gil Bumjin, Kim Jinhyun, Yun Alan Jiwan, Park Kimin, Cho Jaemin, Park Minjun, Park Byungwoo
Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Korea.
Department of Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea.
Nanomaterials (Basel). 2020 Aug 26;10(9):1669. doi: 10.3390/nano10091669.
High-mobility inorganic CuCrO nanoparticles are co-utilized with conventional poly(bis(4-phenyl)(2,5,6-trimethylphenyl)amine) (PTAA) as a hole transport layer (HTL) for perovskite solar cells to improve device performance and long-term stability. Even though CuCrO nanoparticles can be readily synthesized by hydrothermal reaction, it is difficult to form a uniform HTL with CuCrO alone due to the severe agglomeration of nanoparticles. Herein, both CuCrO nanoparticles and PTAA are sequentially deposited on perovskite by a simple spin-coating process, forming uniform HTL with excellent coverage. Due to the presence of high-mobility CuCrO nanoparticles, CuCrO/PTAA HTL demonstrates better carrier extraction and transport. A reduction in trap density is also observed by trap-filled limited voltages and capacitance analyses. Incorporation of stable CuCrO also contributes to the improved device stability under heat and light. Encapsulated perovskite solar cells with CuCrO/PTAA HTL retain their efficiency over 90% after ~900-h storage in 85 °C/85% relative humidity and under continuous 1-sun illumination at maximum-power point.
高迁移率无机CuCrO纳米颗粒与传统的聚（双（4-苯基）（2,5,6-三甲基苯基）胺）（PTAA）共同用作钙钛矿太阳能电池的空穴传输层（HTL），以提高器件性能和长期稳定性。尽管CuCrO纳米颗粒可以通过水热反应轻松合成，但由于纳米颗粒的严重团聚，仅用CuCrO很难形成均匀的HTL。在此，通过简单的旋涂工艺将CuCrO纳米颗粒和PTAA依次沉积在钙钛矿上，形成具有优异覆盖率的均匀HTL。由于存在高迁移率的CuCrO纳米颗粒，CuCrO/PTAA HTL表现出更好的载流子提取和传输能力。通过陷阱填充限制电压和电容分析也观察到陷阱密度的降低。掺入稳定的CuCrO也有助于提高器件在热和光条件下的稳定性。具有CuCrO/PTAA HTL的封装钙钛矿太阳能电池在85°C/85%相对湿度下储存约900小时，并在最大功率点连续1个太阳光照下，其效率保持在90%以上。
