Photovoltaic Devices Employing Ternary PbSxSe1-x Nanocrystals Page: 1 of 18
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Photovoltaic Devices Employing Ternary PbSxSel..
Wanli Ma, Joseph M. Luther, Haimei Zheng, Yue Wu, A. Paul Alivisatos*
Department of Chemistry, University of California, Berkeley
Lawrence Berkeley National Laboratory, Berkeley, CA
*Corresponding author. E-mail: email@example.com
We report solar cells based on highly confined nanocrystals of the ternary
compound PbSxSeis. Crystalline, monodisperse alloyed nanocrystals are
obtained using a one-pot, hot injection reaction. Rutherford back
scattering and energy filtered transmission electron microscopy suggest
that the S and Se anions are uniformly distributed in the alloy
nanoparticles. Photovoltaic devices made using ternary nanoparticles are
more efficient than either pure PbS or pure PbSe based nanocrystal
Colloidal semiconductor nanocrystals display a wealth of size-dependent physical
and chemical properties, including quantum confinement effects, shape dependent
electronic structure,1, 2 and control over assembly through modification of surface
functionalization.3' 4 Photovoltaic devices are an easily recognized potential application
for nanocrystals due, in part, to their high photoactivity, solution processability and low
cost of production. Several schemes for using nanocrystals in solar cells are under active
consideration, including nanocrystal-polymer composites,5 nanoparticle array solar cells,6
films of partially sintered nanoparticles,7 and nanocrystal analogues to dye-sensitized
solar cells.8 A persistent challenge for any nanoparticle-based solar cell is to take
advantage of quantum confinement effects to improve the optical absorption process
without overly hindering the subsequent transport of charge to the electrodes. Various
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Ma, Wanli; Luther, Joseph; Zheng, Haimei; Wu, Yue & Alivisatos, A. Paul. Photovoltaic Devices Employing Ternary PbSxSe1-x Nanocrystals, article, February 5, 2009; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc933485/m1/1/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.