Journal
ACS ENERGY LETTERS
Volume 3, Issue 9, Pages 2173-2180Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b01201
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Funding
- U.S. Department of Energy (DOE) PVRD2 program [DE-EE0008154]
- National Science Foundation (NSF EAGER) [1664669]
- USAID through the U.S.-Pakistan Center for Advanced Studies in Energy program [AID-391-A-15-00001]
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The rapid rise in efficiency and tunable bandgap of metal-halide perovskites makes them highly attractive for use in tandems on silicon. Recently we demonstrated a perovskite-silicon monolithic two-terminal tandem with 23.6% power conversion efficiency. Here, we present work on optical optimization to improve light harvesting that includes thinning out the top transparent electrode to reduce front-surface reflection and parasitic absorption; introducing metal fingers to minimize series resistance losses; and further minimizing reflection loss with a polydimethylsiloxane (PDMS) stamp with random, pyramidal texture. Additionally, to reduce voltage loss while achieving current matching, we employ poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) as a hole transport material instead of NiOx and a wider 1.68 eV bandgap perovskite composition. These optimizations boost the open-circuit voltage to 1.77 V and the short-circuit current density to 18.4 mA/cm(2), culminating in a 25% efficient perovskite-silicon tandem with a 1 cm(2) active area.
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