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Spontaneous Enhancement of the Stable Power Conversion Efficiency in Perovskite Solar Cells [in press]

Moghadamzadeh, Somayeh; Hossain, Ihteaz; Jakoby, Marius; Abdollahi Nejand, Bahram; Rueda-Delgado, Diana; Schwenzer, Jonas Alexander; Gharibzadeh, Saba; Abzieher, Tobias; Khan, Motiur Rahman; Haghighirad, Amir Abbas; Howard, Ian Arthur; Richards, Bryce S; Lemmer, Uli; Paetzold, Ulrich Wilhelm

Abstract (englisch):
The power conversion efficiency (PCE) of lead-halide perovskite solar cells (PSCs) is reported to increase over a period of days after their fabrication while they are stored in dark. Thus far, effects underlying this spontaneous enhancement are not understood. This work investigates the phenomenon for a variety of multi-cation-halide PSCs with different perovskite compositions and architectures. The observations reveal that spontaneous enhancement is not restricted to specific charge- transport layers or perovskite compositions. The highest PCE observed in this study is the enhanced stable PCE of 19% (increased by 4% absolute). An increased open-circuit voltage is the primary contributor to the improved efficiency. Using time-resolved photoluminescence measurements, initially-present low-energy states are identified that disappear over a storage period of a few days. Furthermore, trap states probed by thermally stimulated current technique exist in pristine PSCs and strikingly decrease for stored devices. In addition, ideality factor approaches unity and X-ray diffraction analyses show a lattice strain relaxation over the same period of time. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000100545
Veröffentlicht am 21.02.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 2050-7488, 2050-7496
KITopen-ID: 1000100545
HGF-Programm 43.21.01 (POF III, LK 01)
Quantum Correlations in Condensed Matter
Erschienen in Journal of materials chemistry / A
Band 8
Heft 2
Seiten 670-682
Vorab online veröffentlicht am 05.12.2019
Nachgewiesen in Scopus
Web of Science
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