A quantum dot-silica composite as an efficient spectral converter in a luminescent down-shifting layer of organic photovoltaic devices

We developed a gradient quantum dot (QD)@polyvinylpyrrolidone (PVP)-silica composite as a spectral converter to improve light harvesting of the photoactive layer in organic photovoltaic (OPV) devices. The spectral converter prepared by a simple sol-gel method served as a luminescent down-shifting (L...

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Bibliographic Details
Published in:New journal of chemistry 2019-12, Vol.43 (47), p.18843-18847
Main Authors: Lim, Hong Chul, Koo, Ja-Jung, Kim, Jae Il, Lee, Jin-Kyu, Kim, Zee Hwan, Hong, Jong-In
Format: Article
Language:English
Subjects:
Converters
Donor materials
Electronic devices
Energy conversion efficiency
Incident light
Light
Light transmittance
Photovoltaic cells
Polyvinylpyrrolidone
Quantum dots
Silicon dioxide
Sol-gel processes
Spectra
Thickness
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Summary:We developed a gradient quantum dot (QD)@polyvinylpyrrolidone (PVP)-silica composite as a spectral converter to improve light harvesting of the photoactive layer in organic photovoltaic (OPV) devices. The spectral converter prepared by a simple sol-gel method served as a luminescent down-shifting (LDS) layer that absorbed ultraviolet and emitted visible light. Re-emitted light energy from the LDS layer appeared within the absorption range of the photoactive donor material of P3HT in the OPV devices. We investigated how the light harvesting ability was affected by the concentration of QD@PVP and the thickness of the LDS layer. The OPV devices with the LDS layer showed increased power conversion efficiency (PCE) from 3.38% to 3.68% compared to pristine OPV devices due to improved incident light transmittance and increased light harvesting. The power conversion efficiency of organic photovoltaic (OPV) devices with a luminescent down-shifting layer was enhanced by 8.9% compared to pristine OPV devices.
ISSN:1144-0546
1369-9261
DOI:10.1039/c9nj04080c