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Identification and Mitigation of a Critical Interfacial Instability in Perovskite Solar Cells Employing Copper Thiocyanate Hole-Transporter
University of Oxford, England.
Indian Institute Technology, India.
University of Oxford, England.
University of New South Wales, Australia.
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2016 (English)In: ADVANCED MATERIALS INTERFACES, ISSN 2196-7350, Vol. 3, no 22, 1600571Article in journal (Refereed) Published
Abstract [en]

Metal halide perovskites have emerged as one of the most promising materials for photovoltaics (PVs), with power conversion efficiency of over 22% already demonstrated. In order to compete with traditional crystalline silicon PV, cost and stability are equally important issues that need to be considered besides efficiency. Copper thiocyanate (CuSCN) is an interesting candidate to be used as an inexpensive, thermally stable p-type charge conducting material in perovskite solar cells. Here, we report 13% efficient perovskite solar cells employing CuSCN as the hole-transport material. We compare the stability of cells employing CuSCN with those employing the archetypical organic hole-transporter 2,2 ,7,7 -Tetrakis (N,N-di-p-methoxyphenyl-amine) 9,9-Spirobifluorene (Spiro-OMeTAD), under elevated temperature in ambient atmosphere. Surprisingly, we find that the devices employing CuSCN degrade faster under elevated temperatures than the devices employing SpiroOMeTAD. We discover that an interfacial degradation mechanism occurs at the heterojunction between the perovskite absorber and the CuSCN, even in a dry nitrogen atmosphere, identifying the presence of a critical instability. Interestingly, with the additional coating of the completed cells with a thin film of insulating poly(methyl methacrylate) (PMMA), functioning as a rudimentary "on-cell" encapsulation, we significantly alleviate this issue and deliver efficient perovskite solar cells which survive for more than 1000 hours at 85 degrees C in air with only 25% degradation in performance. Beyond identifying a critical area to address in order to enable CuSCN to be useful for long term operation in perovskite solar cells, our findings indicate that the role of the "encapsulant" is to both keep the environment out, and keep degradation products within the cell.

Place, publisher, year, edition, pages
WILEY , 2016. Vol. 3, no 22, 1600571
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-136375DOI: 10.1002/admi.201600571ISI: 000396444200011OAI: oai:DiVA.org:liu-136375DiVA: diva2:1087786
Note

Funding Agencies|Engineering and Physical Sciences Research Council (EPSRC); China Scholarship Council (CSC)

Available from: 2017-04-10 Created: 2017-04-10 Last updated: 2017-04-10

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