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Light Harvesting and Charge Recombination in CH~3~NH~3~PbI~3~ Perovskite Solar Cells Studied by Hole Transport Layer Thickness Variation by Nevena Marinova; Wolfgang Tress; Robin Humphry-Baker; M. Ibrahim Dar; Vladimir Bojinov; Shaik Mohammed Zakeeruddin; Mohammad Khaja Nazeeruddin; Michael Grätzel is a Engineering article available to read on EtoBox.

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A tailored optimization of perovskite solar cells requires a detailed understanding of the processes limiting the device efficiency. Here, we study the role of the hole transport layer (HTL) spiro-MeOTAD and its thickness in a mesoscopic TiO 2 -based solar cell architecture. We find that a sufficiently thick (200 nm) HTL not only increases the charge carrier collection efficiency but also the light harvesting efficiency. This is due to an enhanced reflection of a smooth HTL/AuÀelectrode interface. The rough CH 3 NH 3 PbI 3 perovskite surface requires an HTL thickness of >400 nm to avoid surface recombination and guarantee a high open-circuit voltage. Analyses of the electroluminescence efficiency and the diode ideality factor show that the open-circuit voltage becomes completely limited by trap-assisted recombination in the perovskite for a thick HTL. Thus, spiro-MeOTAD is a very good HTL choice from the device physics' point of view. The fill factor analyzed by the Suns-V oc method is not transport limited, but trap-recombination limited as well. Consequently, a further optimization of the device has to focus on defects in the polycrystalline perovskite film.

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Author

Nevena Marinova; Wolfgang Tress; Robin Humphry-Baker; M. Ibrahim Dar; Vladimir Bojinov; Shaik Mohammed Zakeeruddin; Mohammad Khaja Nazeeruddin; Michael Grätzel

Publisher

American Chemical Society; American Chemical Society (ACS) (ISSN 1936-0851)

Published

2015

Language

EN

Field

Engineering (Physical Sciences)