Core–shell nanophosphor with enhanced NIR–visible upconversion as spectrum modifier for enhancement of solar cell efficiency |
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| Authors: | Atif F Khan Ravishanker Yadav P K Mukhopadhya Sukhvir Singh Charu Dwivedi Viresh Dutta Santa Chawla |
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| Institution: | (1) National Physical Laboratory, Council of Scientific and Industrial Research, Dr K S Krishnan Road, New Delhi, 110 012, India;(2) Raja Ramanna Centre for Advanced Technology, Indore, MP, India;(3) Photovoltaic Laboratory, Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi, 110 016, India; |
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| Abstract: | A distinct enhancement of upconversion luminescence from core to core/shell (C/S) structure under low flux near infrared (NIR)
excitation at 976 nm has been achieved in lanthanide (Er3+, Yb3+)-doped NaYF4 core with undoped NaYF4 shell nanoparticles (NP). A green chemistry approach has been taken to synthesize monodisperse monophasic C/S NP with the
core (~20 nm) and shell (~5 nm) crystallizing into cubic phase. Hydrophobic C/S NP have been further made hydrophilic by coating
a transparent SHMP layer without affecting luminescence. C/S (NaYF4: Er, Yb/NaYF4) NP integrated dye-sensitized solar cell indicated 11.9% enhancement in overall conversion efficiency under AM 1.5 conditions,
due to NIR–visible spectrum modification by fluorescent NPs. The results indicate great potential of such upconverting C/S
nanophosphor in solar cell applications. |
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