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

Moghadamzadeh, Somayeh 1,2; Hossain, Ihteaz 1,2; Jakoby, Marius 1,2; Abdollahi Nejand, Bahram 1,2; Rueda-Delgado, Diana 1; Schwenzer, Jonas Alexander 2; Gharibzadeh, Saba 1,2; Abzieher, Tobias 2; Khan, Motiur Rahman 1; Haghighirad, Amir Abbas 3; Howard, Ian Arthur 1,2; Richards, Bryce S. ORCID iD icon 1,2; Lemmer, Uli 1,2; Paetzold, Ulrich Wilhelm ORCID iD icon 1,2
1 Lichttechnisches Institut (LTI), Karlsruher Institut für Technologie (KIT)
2 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)
3 Institut für Festkörperphysik (IFP), Karlsruher Institut für Technologie (KIT)

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

Verlagsausgabe §
DOI: 10.5445/IR/1000100545
Veröffentlicht am 21.02.2020
DOI: 10.1039/C9TA09584E
Zitationen: 35
Web of Science
Zitationen: 32
Zitationen: 37
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Institut für Quantenmaterialien und -technologien (IQMT)
Lichttechnisches Institut (LTI)
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
Verlag Royal Society of Chemistry (RSC)
Band 8
Heft 2
Seiten 670-682
Vorab online veröffentlicht am 05.12.2019
Nachgewiesen in Dimensions
Web of Science
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