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Title: Over 20% efficient CIGS-perovskite tandem solar cells
Authors: Guchhait, Asim
Dewi, Herlina Arianita
Leow, Shin Woei
Wan, Hao
Han, Guifang
Firdaus Suhaimi
Mhaisalkar, Subodh Gautam
Wong, Lydia Helena
Mathews, Nripan
Keywords: Engineering::Materials
Issue Date: 2017
Source: Guchhait, A., Dewi, H. A., Leow, S. W., Wang, H., Han, G., Firdaus Suhaimi, . . . Mathews, N. (2017). Over 20% efficient CIGS-perovskite tandem solar cells. ACS Energy Letters, 2(4), 807-812. doi:10.1021/acsenergylett.7b00187
Journal: ACS Energy Letters
Abstract: The development of high efficiency semitransparent perovskite solar cells is necessary for application in integrated photovoltaics and tandem solar cells. However, perovskite’s sensitivity to temperature and solvents impose a restriction on following processes, thus favoring physical vapor deposition for the transparent contacts. Protection may be necessary, especially for high energy sputtering and a transparent buffer layer providing good electrode adhesion and conductivity is desired. Here we evaluate Ag and MoOx buffer layers in pursuit of high efficiency tandem solar cells. The usage of thin Ag as a buffer layer demonstrated indium tin oxide (ITO) contacts that were resistant to delamination and yielded a 16.0% efficiency of semitransparent perovskite solar cell with average transparency of 12% in visible range and >50% in near-infrared. Further application in tandem with Cu(In,Ga)Se showed an overall efficiency of 20.7% in a 4-terminal (4T) configuration, exceeding the individual efficiencies of the subcells.
ISSN: 2380-8195
DOI: 10.1021/acsenergylett.7b00187
Schools: School of Materials Science and Engineering 
Organisations: Singapore−Berkeley Research Initiative for Sustainable Energy
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Energy Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles

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