Lin Dongxu, Xu Xin, Wang Jiming, Zhang Tiankai, Xie Fangyan, Gong Li, Chen Jian, Shi Tingting, Shi Jifu, Liu Pengyi, Xie Weiguang
Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou, Guangdong 510632, People's Republic of China.
State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, People's Republic of China.
ACS Appl Mater Interfaces. 2021 Feb 24;13(7):8138-8146. doi: 10.1021/acsami.0c18009. Epub 2021 Feb 10.
Long-term stability of organic-inorganic hybrid perovskite solar cells (PSCs) is inhibited by ion diffusion. Herein, we introduce a thermally stable and hydrophobic silicone resin layer with a network structure as an interfacial layer between the perovskite and the hole-transporting layer (HTL). Experimental and theoretical investigations confirm that the small Si-O-Si unit in the network forms both Si-I and Pb-O bonds with the perovskite surface, which physically and chemically inhibit the diffusion and self-release of iodine. Besides, the silicone resin layer suppresses the thermal crystallization of spiro-OMeTAD and optimizes the interfacial energy level alignment for hole extraction. The power conversion efficiency (PCE) of a perovskite solar cell with a silicone resin layer is improved to 21.11%. The device maintains more than 90.1% of its original PCE after 1200 h under 85 °C thermal stress, 99.6% after 2000 h under RH ∼55 ± 5%, and 83% of its original PCE after light soaking in air for 1037 h.
离子扩散抑制了有机-无机杂化钙钛矿太阳能电池（PSC）的长期稳定性。在此，我们引入一种具有网络结构的热稳定且疏水的有机硅树脂层作为钙钛矿与空穴传输层（HTL）之间的界面层。实验和理论研究证实，网络中的小Si-O-Si单元与钙钛矿表面形成Si-I键和Pb-O键，从物理和化学上抑制碘的扩散和自释放。此外，有机硅树脂层抑制了螺环-OMeTAD的热结晶，并优化了用于空穴提取的界面能级排列。具有有机硅树脂层的钙钛矿太阳能电池的功率转换效率（PCE）提高到了21.11%。该器件在85°C热应力下1200小时后保持其原始PCE的90.1%以上，在相对湿度约55±5%的条件下2000小时后保持99.6%，在空气中光浸泡1037小时后保持其原始PCE的83%。
