Composites of cross-linked perovskite/polymer with sodium borate for efficient and stable perovskite solar cells. Issue 28 (24th June 2022)

• Record Type: Journal Article
• Authors: Jo, Bonghyun; Han, Gill Sang; Yu, Hyang Mi; Choi, Jinheok; Zhu, Jun; Ahn, Tae Kyu; Namkoong, Gon; Jung, Hyun Suk
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 28(2022)
• Page Start: 14884
• Page End: 14893
• Publication Date: 2022-06-24
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta02565e
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : To solve facile degradation of perovskite absorbers, the anti-solvent dripping method with the polymer/alkali salt mixture is proposed, providing enhanced hydrogen-bond formation, thereby remarkably improving the device performance and stability. Abstract : Although perovskite solar cells have been widely investigated to improve the photovoltaic conversion efficiency so far, perovskite light absorbers have a severe disadvantage for commercialization due to their facile degradation when exposed to humidity and oxygen. Herein, we suggest a synergic anti-solvent dripping strategy to improve the performance and stability of a photovoltaic device using a mixture of PMMA/sodium borate salt (borax) and perovskite materials. We characterized its unique features, i.e., the enhanced hydrogen bond formation between the PMMA/sodium borate mixture and the perovskite light absorber, which induced the lateral grain growth of perovskite films and efficient passivation of the surface and grain boundaries. Consequently, the PMMA/borax-treated devices exhibited significantly improved efficiency from 20.93% to 22.05% and retained 80% of the initial device performance over 1084 h at 22 °C and 50% RH. We believe that this technology will be useful for commercializing various optoelectronic devices.