A Silicon–Singlet Fission Tandem Solar Cell Exceeding 100% External Quantum Efficiency with High Spectral Stability
Pazos-Outón, Luis M
Lee, Ju Min
Futscher, Moritz H
ACS Energy Letters
American Chemical Society
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Pazos-Outón, L. M., Lee, J. M., Futscher, M. H., Kirch, A., Tabachnyk, M., Friend, R., & Ehrler, B. (2017). A Silicon–Singlet Fission Tandem Solar Cell Exceeding 100% External Quantum Efficiency with High Spectral Stability. ACS Energy Letters, 2 476-480. https://doi.org/10.1021/acsenergylett.6b00678
After 60 years of research, silicon solar cell efficiency saturated close to the theoretical limit, and radically new approaches are needed to further improve the efficiency. The use of tandem systems raises this theoretical power conversion efficiency limit from 34% to 45%. We present the advantageous spectral stability of using voltage-matched tandem solar cells with respect to their traditional series-connected counterparts and experimentally demonstrate how singlet fission can be used to produce simple voltage-matched tandems. Our singlet fission silicon-pentacene tandem solar cell shows efficient photocurrent addition. This allows the tandem system to benefit from carrier multiplication and to produce an external quantum efficiency exceeding 100% at the main absorption peak of pentacene.
This work is part of the research programme of the Netherlands Organisation for Scientific Research (NWO). The authors acknowledge financial support from the Engineering and Physical Sciences Research Council of the UK (EPSRC) and King Abdulaziz City for Science and Technology (KACST). LMPO acknowledges the Cambridge Home European Scholarship Scheme (CHESS). MT acknowledges the Gates Cambridge Trust and the Winton Program for the Physics of Sustainability.
External DOI: https://doi.org/10.1021/acsenergylett.6b00678
This record's URL: https://www.repository.cam.ac.uk/handle/1810/263747