Liu Xin, Xiao Yequan, Zeng Qiugui, Jiang Jiexuan, Li Yanbo
Institute of Fundamental and Frontier Sciences , University of Electronic Science and Technology of China , Chengdu 610054 , China.
J Phys Chem Lett. 2019 Oct 17;10(20):6382-6388. doi: 10.1021/acs.jpclett.9b02644. Epub 2019 Oct 8.
Organic-free perovskite solar cells (PSCs) have been considered as the most promising candidate for achieving long-term stability. Here, we demonstrate an organic-free PSC consisting of inorganic CsPbIBr perovskite, nickel oxide hole transport layer, and niobium oxide electron transport layer. A maximum power conversion efficiency (PCE) of 11.20% is achieved with an active area of 5 cm, and it increases to 14.11% with smaller area. More importantly, the organic-free PSCs show excellent thermal stability with PCE remaining above 98% of its initial value when heated at 100 °C for 150 min. Postannealing at a proper temperature further increases its maximum PCE to 14.45%, which is the highest among any reported all-inorganic PSCs with a p-i-n structure. The enhanced performance of the postannealed device is ascribed to the decreased trap-state density and improved interface charge-transfer properties. These results demonstrated that this novel organic-free device architecture can be employed to fabricate efficient and stable PSCs for large-scale manufacturing.
无有机成分的钙钛矿太阳能电池（PSC）被认为是实现长期稳定性最有前景的候选者。在此，我们展示了一种由无机CsPbIBr钙钛矿、氧化镍空穴传输层和氧化铌电子传输层组成的无有机成分PSC。在5平方厘米的有源面积下实现了11.20%的最大功率转换效率（PCE），在较小面积下该效率提高到了14.11%。更重要的是，无有机成分的PSC表现出优异的热稳定性，在100℃加热150分钟时，PCE保持在其初始值的98%以上。在适当温度下进行后退火进一步将其最大PCE提高到14.45%，这在所有报道的具有p-i-n结构的全无机PSC中是最高的。后退火器件性能的提高归因于陷阱态密度的降低和界面电荷转移性能的改善。这些结果表明，这种新型的无有机成分器件结构可用于制造高效且稳定的PSC以进行大规模生产。
