CdSe Quantum-Dot-Sensitized Solar Cell with ∼100% Internal Quantum Efficiency

被引:113
作者
Fuke, Nobuhiro [1 ]
Hoch, Laura B. [2 ]
Koposov, Alexey Y. [2 ]
Manner, Virginia W. [2 ]
Werder, Donald J. [2 ]
Fukui, Atsushi [1 ]
Koide, Naoki [1 ]
Katayama, Hiroyuki [1 ]
Sykora, Milan [2 ]
机构
[1] Sharp Co Ltd, New Technol Dev Ctr, Solar Syst Dev Grp, Nara 6392198, Japan
[2] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
关键词
nanocrystals; quantum dots; solar cell; quantum-dot sensitized solar cell; dye sensitized solar cell; photoelectrochemical solar cell; cadmium selenide; NANOCRYSTALLINE TIO2; ELECTRON-TRANSPORT; PHOTOSENSITIZATION; PBS; CONVERSION; LIGHT; PERFORMANCE; CIRCUIT; SPECTRA; ENERGY;
D O I
10.1021/nn101319x
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We have constructed and studied photoelectrochemical solar cells (PECs) consisting of a photoanode prepared by direct deposition of independently synthesized CdSe nanocrystal quantum dots (NQDs) onto a nanocrystalline TiO2 film (NQD/TiO2), aqueous Na2S or Li2S electrolyte, and a Pt counter electrode We show that light harvesting efficiency (LHE) of the NQD/TiO2 photoanode is significantly enhanced when the surface passivation is changed from tri n octylphosphine oxide(TOPO) to 4-butylamine (BA) In the PEC the use of NQDs with a shorter passivating ligand, BA, leads to a significant enhancement in both the electron injection efficiency it the NQD/TiO2 interface and charge collection efficiency at the NQD/electrolyte interface, with the latter attributed mostly to a more efficient diffusion of the electrolyte through the pores of the photoanode We show that by utilizing BA-capped NQDs and aqueous Li2S as an electrolyte, It is possible to achieve similar to 100% internal, quantum efficiency of photon to-electron conversion, matching the performance of dye sensitized solar cells
引用
收藏
页码:6377 / 6386
页数:10
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