Singh, Trilok ORCID: 0000-0003-4763-3780, Oez, Senol, Sasinska, Alexander, Frohnhoven, Robert, Mathur, Sanjay and Miyasaka, Tsutomu ORCID: 0000-0001-8535-7911 (2018). Sulfate-Assisted Interfacial Engineering for High Yield and Efficiency of Triple Cation Perovskite Solar Cells with Alkali-Doped TiO2 Electron-Transporting Layers. Adv. Funct. Mater., 28 (14). WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1616-3028

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Abstract

Facile electron injection and extraction are two key attributes desired in electron transporting layers to enhance the efficiency of planar perovskite solar cells. Herein it is demonstrated that the incorporation of alkali metal dopants in mesoporous TiO2 can effectively modulate electronic conductivity and improve the charge extraction process by counterbalancing oxygen vacancies acting as nonradiative recombination centers. Moreover, sulfate bridges (SO42-) grafted on the surface of K-doped mesoporous titania provide a seamless integration of absorber and electron-transporting layers that accelerate overall transport kinetics. Potassium doping markedly influences the nucleation of the perovskite layer to produce highly dense films with facetted crystallites. Solar cells made from K:TiO2 electrodes exhibit power conversion efficiencies up to 21.1% with small hysteresis despite all solution coating processes conducted under ambient air conditions (controlled humidity: 25-35%). The higher device efficiencies are attributed to intrinsically tuned electronic conductivity and chemical modification of grain boundaries enabling uniform coverage of perovskite films with large grain size.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Singh, TrilokUNSPECIFIEDorcid.org/0000-0003-4763-3780UNSPECIFIED
Oez, SenolUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sasinska, AlexanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Frohnhoven, RobertUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mathur, SanjayUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Miyasaka, TsutomuUNSPECIFIEDorcid.org/0000-0001-8535-7911UNSPECIFIED
URN: urn:nbn:de:hbz:38-189627
DOI: 10.1002/adfm.201706287
Journal or Publication Title: Adv. Funct. Mater.
Volume: 28
Number: 14
Date: 2018
Publisher: WILEY-V C H VERLAG GMBH
Place of Publication: WEINHEIM
ISSN: 1616-3028
Language: English
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ENHANCEMENT; STABILITY; PERFORMANCEMultiple languages
Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/18962

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