Quantum Dot Donor-Polymer Acceptor Architecture for a FRET Enabled Solar Cell

Kokal, Ramesh K and Raavi, Sai Santosh Kumar and M, Deepa (2019) Quantum Dot Donor-Polymer Acceptor Architecture for a FRET Enabled Solar Cell. ACS Applied Materials & Interfaces. ISSN 1944-8244

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Abstract

Forster resonance energy transfer (FRET) based solution processed solar cell is fabricated with cadmium sulfide (CdS) as the energy donor and poly[N-9-heptadecanyl-2,7-carbazole-alt-5,5-(4,7-di-2-thienyl-2,1,3-benzothiadiazole)] (PCDTBT) as the energy acceptor. Carbon dots (C-dots) deposited on carbon (C)-fabric is applied as a counter electrode (CE). While electron injection from CdS to PCDTBT is energetically disfavoured, evidences for energy transfer between the two components of the cell are obtained in terms of FRET parameters with the relative quantum yield of donor CdS QDs being ~0.3, a Forster radius of ~3.7 nm and an energy transfer efficiency of ~55%. Power conversion efficiency (PCE) of the TiO2/PCDTBT cell without the donor is 0.23% and when coupled with donor CdS QDs, the ensuing TiO2/PCDTBT/CdS cell experiences a 23 times increment in PCE, reaching 5.3%. The complete FRET cell: TiO2/PCDTBT/CdS/ZnS-S2--C-dots/C-fabric produces a PCE of 7.42%, under 1 sun illumination. External quantum efficiency (EQE) studies reveal an enhanced spectral response spanning from 300 to 670 nm, with 300 and 175% increases attained for the FRET enabled TiO2/PCDTBT/CdS/ZnS photoanode compared to the TiO2/PCDTBT photoanode over the blue and green-red portions of the solar spectrum.

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