Journal
NANO LETTERS
Volume 14, Issue 10, Pages 5561-5568Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl501982b
Keywords
Photovoltaics; pervoskite solar cells; single-walled carbon nanotubes; polymer functionalization; hole-transport materials; stability
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Funding
- European Community's Seventh Framework Programme of the SANS project [246124]
- Engineering and Physical Sciences Research Council
- Engineering and Physical Sciences Research Council [1214918, 1511477, GR/S83029/01] Funding Source: researchfish
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Organic-inorganic perovskite solar cells have recently emerged at the forefront of photovoltaics research. Power conversion efficiencies have experienced an unprecedented increase to reported values exceeding 19% within just four years. With the focus mainly on efficiency, the aspect of stability has so far not been thoroughly addressed. In this paper, we identify thermal stability as a fundamental weak point of perovskite solar cells, and demonstrate an elegant approach to mitigating thermal degradation by replacing the organic hole transport material with polymer-functionalized single-walled carbon nanotubes (SWNTs) embedded in an insulating polymer matrix. With this composite structure, we achieve JV scanned power-conversion efficiencies of up to 15.3% with an average efficiency of 10 +/- 2%. Moreover, we observe strong retardation in thermal degradation as compared to cells employing state-of-the-art organic hole-transporting materials. In addition, the resistance to water ingress is remarkably enhanced. These are critical developments for achieving long-term stability of high-efficiency perovskite solar cells.
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