Journal Article

FZJ-2022-03696

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Tantalum Oxide as an Efficient Alternative Electron Transporting Layer for Perovskite Solar Cells

Deo, M. ; Möllmann, A. ; Haddad, J.FZJ* ; Ünlü, F. ; Kulkarni, A.FZJ* ; Liu, M. ; Tachibana, Y. ; Stadler, D. ; Bhardwaj, A. ; Ludwig, T. ; Kirchartz, T.FZJ* ; Mathur, S. (Corresponding author)

2022
MDPI Basel

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Please use a persistent id in citations: http://hdl.handle.net/2128/32047  doi:10.3390/nano12050780

Abstract: Electron transporting layers facilitating electron extraction and suppressing hole recombination at the cathode are crucial components in any thin-film solar cell geometry, including that of metal–halide perovskite solar cells. Amorphous tantalum oxide (Ta2O5) deposited by spin coating was explored as an electron transport material for perovskite solar cells, achieving power conversion efficiency (PCE) up to ~14%. Ultraviolet photoelectron spectroscopy (UPS) measurements revealed that the extraction of photogenerated electrons is facilitated due to proper alignment of bandgap energies. Steady-state photoluminescence spectroscopy (PL) verified efficient charge transport from perovskite absorber film to thin Ta2O5 layer. Our findings suggest that tantalum oxide as an n-type semiconductor with a calculated carrier density of ~7 × 1018/cm3 in amorphous Ta2O5 films, is a potentially competitive candidate for an electron transport material in perovskite solar cells

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Contributing Institute(s):

1. Photovoltaik (IEK-5)

Research Program(s):

1. 1212 - Materials and Interfaces (POF4-121) (POF4-121)

Appears in the scientific report 2022

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