Transparent Quasi-Interdigitated Electrodes for Semitransparent Perovskite Back-Contact Solar Cells
Askhat Jumabekov a b, Giovanni DeLuca c b, Yinghong Hu d b, Gede Adhyaksa e
a Department of Physics, School of Science and Technology, Nazarbayev University, Astana 010000, Kazakhstan
b CSIRO Manufacturing, Clayton, Victoria 3168, Australia
c School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
d Department of Chemistry and Center for NanoScience (CeNS), LMU Munich, 80539 Munich, Germany
e Center for Nanophotonics, AMOLF, 1098 XG Amsterdam, The Netherlands
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Askhat Jumabekov, 080
Publication date: 11th February 2019

Recently, back-contact electrodes have been used to make perovskite-based optoelectronic devices such as solar cells and photodetectors.1-3 A typical back-contact electrode is an array of anode and cathode fingers arranged in an interdigitate fashion on a substrate. In perovskite solar cells with back-contact electrodes, the best device performances have been obtained using so-called quasi-interdigitated electrodes (QIDEs).4 The architectural difference of these electrodes from the typical interdigitated electrodes is that, one-half of the interdigitated electrode fingers (e.g. anode) is deposited over the continuous layer of the other electrode (e.g. cathode) and separated by a thin layer of insulator.

The top contacts of the-state-of-the-art QIDEs are currently composed of opaque Al|NiCo fingers, which are strong absorbers/reflectors of incident light, preventing their use in semitransparent PSCs or as the top electrode in tandem perovskite-silicon solar cells.4,5 Therefore, for QIDEs to reach their full potential, the top electrode must be replaced with a transparent conductor. In this work we report the first transparent quasi-interdigitated electrodes (t-QIDEs) based on indium tin oxide (ITO), which has a high carrier concentration, low sheet resistance, and most importantly, higher optical transmittance (>85% in visible wavelengths) than Al|NiCo. t-QIDEs were produced by replacing the opaque components of existing QIDEs with ITO. Furthermore, we demonstrate the first operational semitransparent back-contact perovskite solar cell. A device with a VOC of 0.88 V and a JSC of 5.6 mA cm−2 produced a modest 1.7% efficiency. The use of ITO allows for illumination of the device from front and rear sides, resembling a bifacial solar cell, both of which yield comparable efficiencies. Coupled optoelectronic simulations reveal this architecture may achieve power conversion efficiencies of up to 11.5% and 13.3% when illuminated from the front and rear side, respectively, using a realistic quality of perovskite material.

The authors acknowledge the financial support from the National Science Foundation (NSF EAGER 1665279), Office of the Chief Executive Postdoctoral Fellowship (CSIRO Manufacturing), DFG Excellence Cluster “Nanosystems Initiative Munich” (NIM), the Center for NanoScience (CeNS), and the Bavarian Collaborative Research Program “Solar Technologies Go Hybrid” (SolTech).

© Fundació Scito
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