An in situ bifacial passivation strategy for flexible perovskite solar module with mechanical robustness by roll-to-roll fabrication. Issue 9 (8th February 2021)

• Record Type: Journal Article
• Authors: Wang, Hongyu; Huang, Zengqi; Xiao, Shuqin; Meng, Xiangchuan; Xing, Zhi; Rao, Li; Gong, Chenxiang; Wu, Runsheng; Hu, Ting; Tan, Licheng; Hu, Xiaotian; Zhang, Shaohua; Chen, Yiwang
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 9(2021)
• Page Start: 5759
• Page End: 5768
• Publication Date: 2021-02-08
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta12067g
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : An in situ bifacial passivation strategy is developed to improve the performance of flexible perovskite solar module during roll-to-roll printing. Abstract : The inevitable interfacial defects in the under layer of perovskite films still hinder the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs), especially of large-area flexible devices up-scaled by roll-to-roll (R2R) technology. Herein, we demonstrate an in situ bifacial passivation strategy via a simple hydroiodic acid (HI) soaking of NiO x -based hole transport layer during R2R printing. Concretely, the trivalent nickel compound on the film surface is reduced to nickel iodide (NiI2 ) by a HI redox reaction, thereby optimizing the interface contact and ameliorating the work function. Meanwhile, NiI2 coordinates with lead atoms in the perovskite to form a Pb–I bond, which induces the orderly growth of the perovskite lattice and enhances the quality of the crystalline film. Consequently, the PCE of the optimized flexible devices reaches up to 19.04% (1 cm 2 ) and 16.15% (15 cm 2 ). Moreover, the stability and mechanical property of these devices are also improved. This work provides a deep understanding of the NiO x /perovskite interface and an approach for printable interface optimization.