TY - JOUR
T1 - Defect Passivation via the Incorporation of Tetrapropylammonium Cation Leading to Stability Enhancement in Lead Halide Perovskite
AU - Krishna, Anurag
AU - Akhavan Kazemi, Mohammad Ali
AU - Sliwa, Michel
AU - Reddy, G. N.Manjunatha
AU - Delevoye, Laurent
AU - Lafon, Olivier
AU - Felten, Alexandre
AU - Do, Mai Trang
AU - Gottis, Sébastien
AU - Sauvage, Frédéric
N1 - Funding Information:
F.S. wishes to thank H2020 research and innovation program for IMPRESSIVE project under grant agreement no. 826013 and Région Hauts-de-France, FEDER and EDF for Ph.D. grants of M.A.A.K. M.S. is indebted to the Chevreul Institute (FR 2638) and the Agence National de la Recherche (ANR-14-CE08-0015-01 Ultrafast Nanoscopy) for financial support. Chevreul Institute (FR 2638), Ministère de l'Enseignement Supérieur, de la Recherche et de l'Innovation, Hauts-de-France Region and FEDER are acknowledged for supporting and funding partially this work. G.N.M.R, L.D., and O.L. gratefully acknowledge the financial support from the IR-RMN-THC FR-3050 CNRS France for conducting solid-state NMR measurements.
Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/3/1
Y1 - 2020/3/1
N2 - Improving the performances of photovoltaic (PV) devices by suppressing nonradiative energy losses through surface defect passivation and enhancing the stability to the level of standard PV represents one critical challenge for perovskite solar cells. Here, reported are the advantages of introducing a tetrapropylammonium (TPA+) cation that combines two key functionalities, namely surface passivation of CH3NH3PbI3 nanocrystals through strong ionic interaction with the surface and bulk passivation via formation of a type I heterostructure that acts as a recombination barrier. As a result, nonencapsulated perovskite devices with only 2 mol% of TPA+ achieve power conversion efficiencies over 18.5% with higher VOC under air mass 1.5G conditions. The devices fabricated retain more than 85% of their initial performances for over 1500 h under ambient conditions (55% RH ± 5%). Furthermore, devices with TPA+ also exhibit excellent operational stability by retaining over 85% of the initial performance after 250 h at maximum power point under 1 sun illumination. The effect of incorporation of TPA+ on the structural and optoelectronic properties is studied by X-ray diffraction, ultraviolet–visible absorption spectroscopy, ultraviolet photon–electron spectroscopy, time-resolved photoluminescence, and scanning electron microscopy imaging. Atomic-level passivation upon addition of TPA+ is elucidated employing 2D solid-state NMR spectroscopy.
AB - Improving the performances of photovoltaic (PV) devices by suppressing nonradiative energy losses through surface defect passivation and enhancing the stability to the level of standard PV represents one critical challenge for perovskite solar cells. Here, reported are the advantages of introducing a tetrapropylammonium (TPA+) cation that combines two key functionalities, namely surface passivation of CH3NH3PbI3 nanocrystals through strong ionic interaction with the surface and bulk passivation via formation of a type I heterostructure that acts as a recombination barrier. As a result, nonencapsulated perovskite devices with only 2 mol% of TPA+ achieve power conversion efficiencies over 18.5% with higher VOC under air mass 1.5G conditions. The devices fabricated retain more than 85% of their initial performances for over 1500 h under ambient conditions (55% RH ± 5%). Furthermore, devices with TPA+ also exhibit excellent operational stability by retaining over 85% of the initial performance after 250 h at maximum power point under 1 sun illumination. The effect of incorporation of TPA+ on the structural and optoelectronic properties is studied by X-ray diffraction, ultraviolet–visible absorption spectroscopy, ultraviolet photon–electron spectroscopy, time-resolved photoluminescence, and scanning electron microscopy imaging. Atomic-level passivation upon addition of TPA+ is elucidated employing 2D solid-state NMR spectroscopy.
KW - defect passivation
KW - perovskite solar cells stability
KW - solid-state NMR spectroscopy
KW - time-resolved photoluminescence
UR - http://www.scopus.com/inward/record.url?scp=85079455207&partnerID=8YFLogxK
U2 - 10.1002/adfm.201909737
DO - 10.1002/adfm.201909737
M3 - Article
AN - SCOPUS:85079455207
SN - 1616-301X
VL - 30
JO - Advanced functional materials
JF - Advanced functional materials
IS - 13
M1 - 1909737
ER -