Journal
ADVANCED MATERIALS
Volume 29, Issue 47, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201704418
Keywords
compositional engineering; open-circuit voltage; optical simulations; Pb-Sn binary alloys; Shockley-Queisser limit
Categories
Funding
- National Science Foundation [DMR-1608279]
- Office of Naval Research [N00014-17-1-2260]
- Asian Office of Aerospace RD [FA2386-15-1-4106]
- Department of Energy SunShot [DE-EE 0006710]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1608279] Funding Source: National Science Foundation
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Extremely high power conversion efficiencies (PCEs) of approximate to 20-22% are realized through intensive research and development of 1.5-1.6 eV bandgap perovskite absorbers. However, development of ideal bandgap (1.3-1.4 eV) absorbers is pivotal to further improve PCE of single junction perovskite solar cells (PVSCs) because of a better balance between absorption loss of sub-bandgap photons and thermalization loss of above-bandgap photons as demonstrated by the Shockley-Queisser detailed balanced calculation. Ideal bandgap PVSCs are currently hindered by the poor optoelectronic quality of perovskite absorbers and their PCEs have stagnated at <15%. In this work, through systematic photoluminescence and photovoltaic analysis, a new ideal bandgap (1.35 eV) absorber composition (MAPb(0.5)Sn(0.5)(I0.8Br0.2)(3)) is rationally designed and developed, which possesses lower nonradiative recombination states, band edge disorder, and Urbach energy coupled with a higher absorption coefficient, which yields a reduced V-oc,V-loss (0.45 V) and improved PCE (as high as 17.63%) for the derived PVSCs. This work provides a promising platform for unleashing the complete potential of ideal bandgap PVSCs and prospects for further improvement.
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