Ideal Bandgap Organic–Inorganic Hybrid Perovskite Solar Cells

Yang, Zhibin; Rajagopal, Adharsh; Jen, Alex K. ‐Y.

doi:10.1002/adma.201704418

Ideal Bandgap Organic–Inorganic Hybrid Perovskite Solar Cells

Journal Article · Tue Nov 14 00:00:00 EST 2017 · Advanced Materials

DOI:https://doi.org/10.1002/adma.201704418· OSTI ID:1413784

^[1]; Rajagopal, Adharsh ^[1]; ^[2]

Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA
Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA, Department of Chemistry City University of Hong Kong Kowloon Hong Kong, Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong

Abstract

Extremely high power conversion efficiencies (PCEs) of ≈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 (I _0.8 Br _0.2 ) 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,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.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: EE0006710

OSTI ID:: 1413784

Alternate ID(s):: OSTI ID: 1537365

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 47 Vol. 29; ISSN 0935-9648

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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