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  • 1
    Publication Date: 2015-11-28
    Description: Solar photoconversion in semiconductors is driven by charge separation at the interface of the semiconductor and contacting layers. Here we demonstrate that time-resolved photoinduced reflectance from a semiconductor captures interfacial carrier dynamics. We applied this transient photoreflectance method to study charge transfer at p-type gallium-indium phosphide (p-GaInP2) interfaces critically important to solar-driven water splitting. We monitored the formation and decay of transient electric fields that form upon photoexcitation within bare p-GaInP2, p-GaInP2/platinum (Pt), and p-GaInP2/amorphous titania (TiO2) interfaces. The data show that a field at both the p-GaInP2/Pt and p-GaInP2/TiO2 interfaces drives charge separation. Additionally, the charge recombination rate at the p-GaInP2/TiO2 interface is greatly reduced owing to its p-n nature, compared with the Schottky nature of the p-GaInP2/Pt interface.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yang, Ye -- Gu, Jing -- Young, James L -- Miller, Elisa M -- Turner, John A -- Neale, Nathan R -- Beard, Matthew C -- New York, N.Y. -- Science. 2015 Nov 27;350(6264):1061-5. doi: 10.1126/science.aad3459.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Renewable Energy Laboratory, Chemistry and Nanoscience Center, Golden, CO, 80401, USA. ye.yang@nrel.gov matt.beard@nrel.gov. ; National Renewable Energy Laboratory, Chemistry and Nanoscience Center, Golden, CO, 80401, USA. ; National Renewable Energy Laboratory, Chemistry and Nanoscience Center, Golden, CO, 80401, USA. Material Science and Engineering Program, University of Colorado, Boulder, CO, 80309, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26612947" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2011-12-17
    Description: Multiple exciton generation (MEG) is a process that can occur in semiconductor nanocrystals, or quantum dots (QDs), whereby absorption of a photon bearing at least twice the bandgap energy produces two or more electron-hole pairs. Here, we report on photocurrent enhancement arising from MEG in lead selenide (PbSe) QD-based solar cells, as manifested by an external quantum efficiency (the spectrally resolved ratio of collected charge carriers to incident photons) that peaked at 114 +/- 1% in the best device measured. The associated internal quantum efficiency (corrected for reflection and absorption losses) was 130%. We compare our results with transient absorption measurements of MEG in isolated PbSe QDs and find reasonable agreement. Our findings demonstrate that MEG charge carriers can be collected in suitably designed QD solar cells, providing ample incentive to better understand MEG within isolated and coupled QDs as a research path to enhancing the efficiency of solar light harvesting technologies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Semonin, Octavi E -- Luther, Joseph M -- Choi, Sukgeun -- Chen, Hsiang-Yu -- Gao, Jianbo -- Nozik, Arthur J -- Beard, Matthew C -- New York, N.Y. -- Science. 2011 Dec 16;334(6062):1530-3. doi: 10.1126/science.1209845.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Renewable Energy Laboratory, Golden, CO 80401, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22174246" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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