Asymmetric alkyl diamine based Dion–Jacobson low-dimensional perovskite solar cells with efficiency exceeding 15%. Issue 19 (11th May 2020)

• Record Type: Journal Article
• Authors: Zhao, Weidong; Dong, Qingshun; Zhang, Jiangwei; Wang, Shi; Chen, Min; Zhao, Chunyi; Hu, Mingyu; Jin, Shengye; Padture, Nitin P.; Shi, Yantao
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 19(2020)
• Page Start: 9919
• Page End: 9926
• Publication Date: 2020-05-11
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta02706e
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : DMAPA 2+ as a diammonium spacer cation to balance high efficiency and high stability for low-dimensional Dion–Jacobson perovskite solar cells. Abstract : Low-dimensional (LD) Dion–Jacobson perovskites (DJPs) are showing great potential to solve the stability issue of perovskite solar cells (PSCs). However, it is still a challenge to simultaneously obtain high power conversion efficiency (PCE) and high stability in DJP-LD-PSCs. Here, we present an asymmetric alkyl diammonium 3-(dimethylammonium)-1-propylammonium (DMAPA 2+ ) as a spacer cation to resolve this issue. With the small adjacent inorganic interlayer distance, PSCs based on LD (DMAPA)MA n −1 Pb n I3 n +1 ( n = 1) achieve a PCE of 3.85%, the currently highest PCE for PSCs based on n = 1 LD-DJPs. The systematic study of the crystallization kinetics of DJPs with higher n values ( n = 3, 4, 5) demonstrates that the perovskite quality is mainly dominated by the formation and decomposition of their intermediate phase. PSCs based on n = 4 LD-DJP (DMAPA)MA3 Pb4 I13, with vertical crystal orientation, hierarchical phase distribution and low trap density, yield high PCEs up to 15.16%, and excellent stability with over 90% of the initial PCE retained without encapsulation after being stored at 85 °C in air for 1000 hours and ∼80% PCE retained after 300 h of continuous operation under 1-sun illumination in air.