Material and Device Design for Multijunction Perovskite Solar Cells
Rene Janssen b
a Molecular Materials and Nanosystems, Institute for Complex Molecular Systems, Eindhoven University of Technology, The Netherlands
b Dutch Institute for Fundamental Energy Research, Eindhoven, The Netherlands
nanoGe Fall Meeting
Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
#AppTGT - Application Targets for Next Generation Photovoltaics
Barcelona, Spain, 2022 October 24th - 28th
Organizers: Nasim Zarrabi and Paul Meredith
Invited Speaker, Rene Janssen, presentation 252
Publication date: 11th July 2022

A unique property of metal halide perovskite solar cells materials is their widely tunable optical bandgap, which enables their use in multijunction solar cells. However, both mixed-halide wide-bandgap perovskites and lead-tin narrow-bandgap perovskites suffer from non-radiative recombination due to the formation of bulk traps and interfacial recombination centers which limit the open-circuit voltage of sub-cells and consequently of the integrated tandem. Additionally, the complex optical stack in a multijunction solar cell can lead to losses stemming from parasitic absorption and reflection of incident light which aggravates the current mismatch between sub-cells, thereby limiting the short-circuit current density of the tandem. Here, we present an integrated all-perovskite tandem solar cell that uses surface passivation strategies to reduce non-radiative recombination at the perovskite-fullerene interfaces, yielding a high open-circuit voltage. By using optically benign transparent electrode and charge-transport layers, absorption in the narrow-bandgap sub-cell is improved, leading to an improvement in current-matching between sub-cells. Collectively, these strategies allow the development of a monolithic tandem solar cell exhibiting a power-conversion efficiency of over 23%.

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