Impact of PC 71 BM layer on the performance of perovskite solar cells prepared at high moisture conditions using a low t
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Impact of PC71BM layer on the performance of perovskite solar cells prepared at high moisture conditions using a low temperature annealed ZnO thin film as the electron transport layer Carlos A. Rodrı´guez-Castan˜eda1,*, Paola M. Moreno-Romero1, D. Mateus Torres-Herrera1, Candy A. Enrı´quez-Alamares2, Hugo J. Cortina-Marrero2, I. Montoya De Los Santos2, Maykel Courel3, F. J. Sa´nchez-Rodrı´guez4, Hailin Hu1, and L. Hechavarrı´a-Difur2,*
1
Instituto de Energías Renovables, Universidad Nacional Autónoma de México, C.P. 62580 Temixco, Morelos, Mexico Instituto de Estudios de La Energía, Universidad del Istmo, Santo Domingo Tehuantepec, C.P. 70760 Oaxaca, Mexico 3 Centro Universitario de Los Valles, Universidad de Guadalajara, C.P. 46600, Ameca, Jalisco, Mexico 4 Facultad de Ciencias Físico-Matemáticas, Universidad Autónoma de Sinaloa, C.P. 80010 Culiacán, Sinaloa, Mexico 2
Received: 12 March 2020
ABSTRACT
Accepted: 27 October 2020
ZnO is a promising electron transport material with high electron mobility compared to TiO2 and SnO2. However, its high basicity and the presence of hydroxyl groups at the ZnO surface induces thermochemical decomposition of hybrid perovskites though proton transfer reactions. In perovskite solar cells (PSCs), these deprotonation reactions produce chemical products at the interface between ZnO and perovskite, which obstacle charge carrier extraction process and lead to low efficiency of the solar cells. In this work, PC71BM thin films of three different thickness, 19, 11 and 6 nm, were deposited on top of ZnO layers, prepared by sol–gel spin coating and annealed at 150 °C. It is found that low temperature prepared ZnO films contain deep trap states, and the effective optical band gap of ZnO/PC71BM double layers is slightly reduced with the thickness of the fullerene derivative. The presence of an interfacial PC71BM layer on top of ZnO enhances the stability of the upcoming perovskite coatings and promotes the passivation of trap states at the ZnO surface. Interestingly, the best PC71BM-passivated PSC, fabricated under relative humidity (RH) of 60–65%, achieves a maximum power conversion efficiency (PCE) of 13.3%, whereas those PSCs with only ZnO as the electron transport layer show an average PCE of 5.5%. However, the stability under continuous illumination of PC71BM based PSCs is significantly lower than expected, probably due to the PC71BM degradation under high RH conditions.
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Springer Science+Business
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https://doi.org/10.1007/s10854-020-04766-w
J Mater Sci: Mater Electron
1 Introduction Planar heterojunction hybrid perovskite solar cells (PSCs) have attracted extensive attention due to their exceptional power conversion efficiency (PCE) higher than 20% [1]. Part of the current progress is owing to development in different metal oxide electron-transport layers (ETL) such as TiO2, WO3, SnO2, ZnO, in addition to organic molecules like fullerenes and their derivatives [2].
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