Universität zu Köln

Deo, Meenal ORCID: 0000-0002-5214-0668, Moellmann, Alexander, Haddad, Jinane, Unlu, Feray, Kulkarni, Ashish, Liu, Maning ORCID: 0000-0001-9875-0966, Tachibana, Yasuhiro ORCID: 0000-0003-4948-6147, Stadler, Daniel, Bhardwaj, Aman, Ludwig, Tim ORCID: 0000-0002-3633-805X, Kirchartz, Thomas and Mathur, Sanjay (2022). Tantalum Oxide as an Efficient Alternative Electron Transporting Layer for Perovskite Solar Cells. Nanomaterials, 12 (5). BASEL: MDPI. ISSN 2079-4991

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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 x 10(18)/cm(3) in amorphous Ta2O5 films, is a potentially competitive candidate for an electron transport material in perovskite solar cells.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Deo, Meenal UNSPECIFIED orcid.org/0000-0002-5214-0668 UNSPECIFIED Moellmann, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Haddad, Jinane UNSPECIFIED UNSPECIFIED UNSPECIFIED Unlu, Feray UNSPECIFIED UNSPECIFIED UNSPECIFIED Kulkarni, Ashish UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Maning UNSPECIFIED orcid.org/0000-0001-9875-0966 UNSPECIFIED Tachibana, Yasuhiro UNSPECIFIED orcid.org/0000-0003-4948-6147 UNSPECIFIED Stadler, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Bhardwaj, Aman UNSPECIFIED UNSPECIFIED UNSPECIFIED Ludwig, Tim UNSPECIFIED orcid.org/0000-0002-3633-805X UNSPECIFIED Kirchartz, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-680763
DOI:	10.3390/nano12050780
Journal or Publication Title:	Nanomaterials
Volume:	12
Number:	5
Date:	2022
Publisher:	MDPI
Place of Publication:	BASEL
ISSN:	2079-4991
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TA2O5 NANOWIRES; COMPACT LAYER; THIN-FILMS; HETEROJUNCTION; GENERATION; STABILITY Multiple languages Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68076