Improving the Performance of Perovskite Solar Cells Through Solvent Vapor Annealing‐based Morphology Control of the Hole‐Transport Layer. Issue 7 (9th May 2018)

• Record Type: Journal Article
• Authors: Liu, Guanchen; Xie, Xiaoyin; Zeng, Fanming; Liu, Zhihai
• Is Part Of: Energy technology. Volume 6:Issue 7(2018:Jul.)
• Page Start: 1283
• Page End: 1289
• Publication Date: 2018-05-09
• Subjects: hole-transport layer -- interface engineering -- perovskite solar cells -- photovoltaics -- spiro-OMeTAD; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.201800066
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract: In this work, we improved the performance of perovskite solar cells (PSCs) by controlling the morphology of 2, 2′, 7, 7′‐tetrakis‐( N, N ‐di‐ p ‐methoxyphenylamine)‐9, 9′‐spirobifluorene (spiro‐OMeTAD) layers using a solvent vapor annealing method. We found that this technique could result in a smoother morphology of the spiro‐OMeTAD layer, which further improved the contacts at the perovskite/spiro‐OMeTAD and spiro‐OMeTAD/Au interfaces. Consequently, the power conversion efficiency (PCE) of PSCs improved from 14.62 to 16.73 % along with simultaneous enhancements of the open‐circuit voltage, short‐circuit current density, and fill factor. The hysteresis of the PSCs decreased significantly from 4.4 to 0.6 %. Moreover, the degradation in the PCE of the PSCs for long‐term storage was reduced from 19 to 14 % over the period of 144 hours. The best PSC based on a solvent vapor‐annealed spiro‐OMeTAD layer exhibited a high PCE of 17.15 % with a stable power output. Our results indicate that using solvent vapor annealing to control the morphology of spiro‐OMeTAD layers is an effective method for fabricating high‐performance PSCs. Abstract : Taking control : Using solvent vapor annealing to control the morphology of spiro‐OMeTAD layers using a solvent vapor annealing method leads to a smoother morphology of the spiro‐OMeTAD layer, which further improves the contacts between perovskite/spiro‐OMeTAD and spiro‐OMeTAD/Au. This significantly improves the performance of perovskite solar cells resulting in increased efficiency.