Dual Interfacial Modifications Enable High Performance Semitransparent Perovskite Solar Cells with Large Open Circuit Voltage and Fill Factor. Issue 9 (22nd December 2016)

• Record Type: Journal Article
• Authors: Xue, Qifan; Bai, Yang; Liu, Meiyue; Xia, Ruoxi; Hu, Zhicheng; Chen, Ziming; Jiang, Xiao‐Fang; Huang, Fei; Yang, Shihe; Matsuo, Yutaka; Yip, Hin‐Lap; Cao, Yong
• Is Part Of: Advanced energy materials. Volume 7:Issue 9(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-12-22
• Subjects: fullerene bisadduct -- high open circuit voltage -- interface engineering -- perovskite solar cells -- semitransparent solar cells; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201602333
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract : In this work, both anode and cathode interfaces of p‐i‐n CH3 NH3 PbI3 perovskite solar cells (PVSCs) are simultaneously modified to achieve large open‐circuit voltage (Voc ) and fill factor (FF) for high performance semitransparent PVSCs (ST‐PVSCs). At the anode, modified NiO serves as an efficient hole transport layer with appropriate surface property to promote the formation of smooth perovskite film with high coverage. At the cathode, a fullerene bisadduct, C60 (CH2 )(Ind), with a shallow lowest unoccupied molecular orbital level, is introduced to replace the commonly used phenyl‐C61 ‐butyric acid methyl ester (PCBM) as an alternative electron transport layer in PVSCs for better energy level matching with the conduction band of the perovskite layer. Therefore, the Voc, FF and power conversion efficiency (PCE) of the PVSCs increase from 1.05 V, 0.74 and 16.2% to 1.13 V, 0.80 and 18.1% when the PCBM is replaced by C60 (CH2 )(Ind). With the advantages of high Voc and FF, ST‐PVSCs are also fabricated using an ultrathin transparent Ag as cathode, showing an encouraging PCEs of 12.6% with corresponding average visible transmittance (AVT) over 20%. These are the highest PCEs reported for ST‐PVSCs with similar AVTs paving the way for using ST‐PVSCs as power generating windows. Abstract : The anode and cathode interfaces of CH3 NH3 PbI3 perovskite solar cells are optimized simultaneously. The shallow lowest unoccupied molecular level of C60 (CH2 )(Ind) provides better energy level alignment and surface passivation. High performance opaque cell with a power conversion efficiency (PCE) of 18.1% (Voc : 1.13 V, FF: 0.8) and semitransparent cell with a PCE of 12.6% (AVT>20%) are achieved.