Volume 24 Issue 1 - May 24, 2013
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Hsisheng Teng
High-performance quantum dot-sensitized solar cells based on sensitization with CuInS2 quantum dots/CdS heterostructure
Article Digest
Chuh-Yung Chen
Efficient decolorization of azo dye Reactive Black B involving aromatic fragment degradation in buffered Co2+/PMS oxidative processes with a ppb level dosage of Co2+-catalyst
Pao-Chi Liao
Cell secretome analysis using hollow fiber culture system leads to the discovery of CLIC1 protein as a novel plasma marker for nasopharyngeal carcinoma
Chung-Hsien Wu
Psychiatric Document Retrieval Using a Discourse-Aware Model
Hsiang-Chen Chui
Plasmonic resonances of gold nanoparticle pairs
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NCKU, ARTC sign MoU to boost up Taiwan's automobile industry
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NCKU, ASE host R & D Application Forum to promote collaboration
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NCKU host Nan-Ying Forum on Taiwan's nuclear power policy
NCKU Press Center
NCKU wise club to mark new pinnacle for Taiwan's petrochemical industry
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NCKU foreign language & literature department sets up the bard's corner
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NCKU student-designed cards to send for mother's day
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Editorial Group
High-performance quantum dot-sensitized solar cells based on sensitization with CuInS2 quantum dots/CdS heterostructure
Tzung-Luen Li1, Yuh-Lang Lee1 and Hsisheng Teng1,2,*
1 Department of Chemical Engineering and Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan, 70101, Taiwan
2 Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan, 70101, Taiwan
A high-performance quantum dot-sensitized solar cell (QDSSC) is reported, which consists of a TiO2/CuInS2-QDs/CdS/ZnS photoanode, a polysulfide electrolyte, and a CuS counter electrode. The sensitization process involves attaching presynthesized CuInS2 QDs (3.5 nm) to a TiO2 substrate with a bifunctional linker, followed by coating CdS with successive ionic layer adsorption and reaction (SILAR) and ZnS as the last SILAR layer for passivation. This process constructs a sensitizing layer that comprises CdS nanocrystals, closely packed around the earlier-linked CuInS2 QDs, which serve as the pillars of the layer. The CuS counter electrode, prepared via successive ionic solution coating and reaction, has a small charge transfer resistance in the polysulfide electrolyte. The QDSSC exhibits a short-circuit photocurrent (Jsc) of 16.9 mA cm_2, an open-circuit photovoltage (Voc) of 0.56 V, a fill factor of 0.45, and a conversion efficiency of 4.2% under one-sun illumination. The heterojunction between the CuInS2 QDs and CdS extends both the optical absorption and incident photon conversion efficiency (IPCE) spectra of the cell to a longer wavelength of approximately 800 nm, and provides an IPCE of nearly 80% at 510 nm. The high TiO2 surface coverage of the sensitizers suppresses recombination of the photogenerated electrons. This results in a longer lifetime for the electrons, and therefore, the high Voc value. The notably high Jsc and Voc values demonstrate that this sensitization strategy, which exploits the quantum confinement reduction and other synergistic effects of the CuInS2-QDs/CdS/ZnS heterostructure, can potentially outperform those of other QDSSCs.
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