Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
DOI: https://doi.org/10.29363/nanoge.abxpvperopto.2018.113
Publication date: 11th December 2017
Hybrid perovskite solar cells (PSCs) have attracted an unprecedented research attention due to their skyrocketing record power conversion efficiency (PCE), which now exceeds 22% in less than a decade from the initial PCE of 3.8%. Besides the excellent optoelectronic properties of the perovskite absorbers, the high efficiencies are also dependent on device architecture, preparation methods and advanced device engineering. In this study, the role of device architecture (planar n-i-p versus inverted p-i-n structure) and charge-selective interlayer on the photophysical properties of the perovskite absorber and device performance are explored. We employ FA0.85MA0.15PbBr0.45I2.55 as the perovskite absorber and chloride-capped TiO2 colloidal nanocrystals (TiO2-Cl) and poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as the substrate layers in the conventional and inverted structures, respectively. Extremely different device performances are demonstrated by the two structures. The one with the TiO2-Cl at the substrate interface display a PCE of 19.9%, while the one using PEDOT:PSS shows about 15.1% efficiency. The photophysical and electrical investigations indicate that the TiO2-Cl interface has lower number of traps, underlining the importance of interfaces for achieving highly performing perovskite solar cells.
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