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Size-controlled CdSe quantum dots to boost light harvesting and stability in perovskite photovoltaic cells

Abstract

Herein, we report that incorporation of size-controlled CdSe quantum dots (QDs) into perovskite photovoltaic cells (PSCs) boosts their light harvesting capability. X-ray photoemission and optical absorption spectroscopy analyses also show that the electronic structure of CdSe QDs makes them as efficient charge transfer mediators between perovskite and Spiro-MeOTAD layers. In addition, electrochemical impedance spectroscopy experiments demonstrate that QDs help to decrease charge transfer resistance at the interfaces. Additionally, the time-correlated single photon counting measurements show that the small (2 nm) QDs enhance visible light collection of PSCs in the short wavelength region via the Förster resonance energy transfer while the large (4 nm) QDs improve light collection of PSCs in the long wavelength region via enhanced light backscattering at the perovskite/QD interface. Moreover, the photocurrent density in the PSCs with QDs was retained over 95% of the initial value for 100 h stability test, thus supporting that the perovskite layer has been encapsulated by QDs plays to prevent penetration of water molecules through a perovskite layer. Consequently, these results support that utilization of size-controlled hybrid QDs could open a new route to realize high-performance PSCs even in humidity conditions.

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Supplementary files

Publication details

The article was accepted on 13 Jun 2017 and first published on 15 Jun 2017


Article type: Paper
DOI: 10.1039/C7NR03487C
Citation: Nanoscale, 2017, Accepted Manuscript
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    Size-controlled CdSe quantum dots to boost light harvesting and stability in perovskite photovoltaic cells

    M. N. Lintangpradipto, N. Tsvetkov, B. C. Moon and J. K. Kang, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR03487C

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