Back-contact perovskite solar cells with honeycomb-like charge collecting electrodes. (August 2018)

• Record Type: Journal Article
• Authors: Hou, Qicheng; Bacal, Dorota; Jumabekov, Askhat N.; Li, Wei; Wang, Ziyu; Lin, Xiongfeng; Ng, Soon Hock; Tan, Boer; Bao, Qiaoliang; Chesman, Anthony S.R.; Cheng, Yi-Bing; Bach, Udo
• Is Part Of: Nano energy. Volume 50(2018)
• Page Start: 710
• Page End: 716
• Publication Date: 2018-08
• Subjects: Perovskite solar cells -- Back-contact -- Honeycomb-shape -- Photolithography -- Quasi-interdigitated electrodes; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2018.06.006
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Back-contact electrodes have been broadly applied to silicon photovoltaics to enhance their performance and avoid parasitic absorption from window materials and charge collection grids [1, 2]. Here we introduce an innovative back-contact design for perovskite solar cells (PSCs) derived from our recently described quasi-interdigitated back-contact architecture [3]. The back contact consists of a top electrode, which has a honeycomb-like grid geometry, that is separated from the underlying planar bottom electrode by a similarly shaped insulating Al2 O3 layer. This new design has higher structural robustness, as well as better defect tolerance, resulting in the highest short-circuit current (~ 16.4 mA/cm 2 ) and stabilized power output (~ 4%) for a back-contact PSC to date. The improved performance was attributed to an increased charge collecting efficiency, with photocurrent mapping revealing what electrode dimensions are required for optimum efficiency. Graphical abstract: fx1 Highlights: A new device configuration for back-contact perovskite solar cells is presented. The design features a defect tolerant honeycomb-like top electrode. The effect of electrode pitch size on device performance was revealed. Record short circuit currents and stabilized power outputs were achieved.