Solution-processed Perovskite-colloidal Quantum Dot Tandem Solar Cells for Photon Collection Beyond 1000 nm
Afsal Manekkathodi a, Bin Chen b, Junghwan Kim b, Se-Woong Baek b, Benjamin Scheffel b, Yi Hou b, Olivier Ouellette b, Makhsud Saidaminov b, Oleksandr Voznyy b, Vinod Madhavan a, Abdelhak Belaidi a, Sahel Ashhab a, Edward Sargent b
a Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University, Doha, P.O. Box: 34110, Doha, 0, Qatar
b Department of Electrical and Computer Engineering, University of Toronto, Canada, King's College Road, 10, Toronto, Canada
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)
Tsukuba-shi, Japan, 2020 January 20th - 22nd
Organizers: Michio Kondo and Takurou Murakami
Oral, Sahel Ashhab, presentation 093
Publication date: 14th October 2019

Multi-junction solar cells based on solution-processed metal halide perovskites offer a route to increased power conversion efficiency (PCE); however, the limited options for infrared (IR)-absorbing back cells have constrained progress. Colloidal quantum dot (CQD)-based solar cells, which are solution-processed and have bandgaps tunable to wavelengths beyond 1000 nm, are attractive candidates for this role. Here we report a solution-processed four-terminal (4T) tandem solar cell comprised of a perovskite front cell and a CQD back cell. The 4T tandem provides a PCE exceeding 20%, the highest PCE reported to date for a perovskite-CQD tandem solar cell. The front semi-transparent perovskite solar cell employs a dielectric-metal-dielectric (DMD) electrode constructed from a metal film (silver/gold) sandwiched between dielectric (MoO3) layers. The highest-performing front semi-transparent perovskite solar cells exhibit a PCE of ~18%. By tuning the wavelength-dependent transmittance of the DMD layer based on the zero-reflection condition of optical admittance, we build semi-transparent perovskite solar cells with a 25% increase in IR transmittance compared to baseline devices. The back cell is fabricated based on an IR CQD absorber layer complementary to the IR transmittance of the semi-transparent perovskite front cell. Solution-processed hybrid tandem photovoltaics (PV) combining these technologies offer to contribute to higher-efficiency solar cells for next-generation flexible photovoltaic (PV) devices.

This work was made possible by NPRP grant #8-086-1-017 from the Qatar National Research Fund. This research was also supported by Ontario Research Fund-Research Excellence program (ORF7-Ministry of Research and Innovation, Ontario Research Fund-Research Excellence Round 7); and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. The findings achieved herein are solely the responsibility of the authors.

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