Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/35963
Title: Improving the Morphology Stability of Spiro-OMeTAD Films for Enhanced Thermal Stability of Perovskite Solar Cells
Authors: SONG, Wenya 
Rakocevic, Lucija
THIRUVALLUR EACHAMBADI, Ragha 
Qiu, Weiming
Bastos, Joao P.
Gehlhaar, Robert
KUANG, Yinghuan 
Hadipour, Afshin
AERNOUTS, Tom 
POORTMANS, Jef 
Issue Date: 2021
Publisher: AMER CHEMICAL SOC
Source: Acs Applied Materials & Interfaces, 13 (37) , p. 44294 -44301
Abstract: To guarantee a long lifetime of perovskite-based photovoltaics, the selected materials need to survive relatively hightemperature stress during the solar cell operation. Highly efficient ni-p perovskite solar cells (PSCs) often degrade at high operational temperatures due to morphological instability of the hole transport material 2,2',7,7'-tetrakis (N,N-di-p-methoxyphenyl-amine)9,9'-spirobifluorene (Spiro-OMeTAD). We discovered that the detrimental large-domain spiro-OMeTAD crystallization is caused by the simultaneous presence of tert-butylpyridine (tBP) additive and gold (Au) as a capping layer. Based on this discovery and our understanding, we demonstrated facile strategies that successfully stabilize the amorphous phase of spiro-OMeTAD film. As a result, the thermal stability of n- i-p PSCs is largely improved. After the spiro-OMeTAD films in the PSCs were stressed for 1032 h at 85 degrees C in the dark in nitrogen environment, reference PSCs retained only 22% of their initial average power conversion efficiency (PCE), while the best target PSCs retained 85% relative average PCE. Our work suggests facile ways to realize efficient and thermally stable spiro-OMeTAD containing n-i-p PSCs.
Notes: Song, WY; Poortmans, J (corresponding author), IMEC, Partner Solliance & Energyville, B-3600 Genk, Belgium.; Song, WY; Poortmans, J (corresponding author), Katholieke Univ Leuven, Dept Elect Engn ESAT, B-3001 Heverlee, Belgium.; Poortmans, J (corresponding author), UHasselt, Inst Mat Res IMO IMOMEC, B-3590 Diepenbeek, Belgium.
wenya.song@imec.be; jef.poortmans@imec.be
Keywords: spiro-OMe;TAD;morphology stability;perovskite solar cells;thermal stability;n-i-p
Document URI: http://hdl.handle.net/1942/35963
ISSN: 1944-8244
e-ISSN: 1944-8252
DOI: 10.1021/acsami.1c11227
ISI #: WOS:000700877100042
Rights: 2021 American Chemical Society
Category: A1
Type: Journal Contribution
Validations: ecoom 2022
Appears in Collections:Research publications

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