Abstract
• Simple thin film manufacturing process. • Improved the perovskite film quality. • Enhanced PCE and environment stability. Perovskite solar cells (PSCs) have been the most promising candidate for next generation commercial solar cells after silicon cells. However, the original perovskite films always present defects showing pinholes and uneven particles causing low performance and stability during operation. Here, we prepared high quality and outstanding performance perovskite films through low pressure assisted (LPA, −1 bar) thin film growth strategy to control morphology and crystallinity form precursor perovskite solution. Consequently, the PSCs (target) showed a maximum power conversion efficiency (PCE) of 20.33% based on LPA growth perovskite films, while the PCE for normal annealing devices (control) was only 19.47%. The target devices also showed superior stability at a humidity range of 20%-30% compared with control devices. After 1000 h, 66.50% initial PCE was remained for target devices (20.33% to 13.52%), only 45.45% for control devices (19.47% to 8.85%).
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