Journal
THIN SOLID FILMS
Volume 517, Issue 19, Pages 5722-5727Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2009.02.131
Keywords
Biologically inspired inorganic material; Cobalt layered double hydroxide; Inorganic p-type semiconductor; Organic/inorganic hybrid bulk heterojunction solar cell; X-ray diffraction; Scanning electron microscopy; Electrical properties and measurements
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Funding
- U.S. Department of Energy [DE-AC02-05CH11231, DEFG03-02ER46006]
- Institute for Collaborative Biotechnologies [DAAD19-03-D-0004]
- MRSEC Program [DMR05-20415]
- National Science Foundation
- National Science Foundation Graduate Research Fellowship
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A low-cost, environmentally benign method was used to prepare nanostructured thin films of Co-5(OH)(8) (NO3)(2)center dot 2H(2)O, a layered double hydroxide p-type semiconductor. When infilled with poly(3-butylthiophene) (P3BT), an n-type semiconducting polymer, the resulting hybrid bulk heterojunction yields a photovoltaic device. The indium-doped tin oxide/Co-5(OH)(8)(NO3)(2)center dot 2H(2)O/P3BT/Al cell described here is an unprecedented example of an optoelectronic device fabricated by a low-cost biologically inspired pathway independent of organic structure-directing agents. Under illumination, this proof-of-principle device yields an open circuit voltage of 1.38 V, a short circuit current of 9 mu A/cm(2), a fill factor of 26% and a power efficiency of 3.2.10(-3)%. While the open circuit voltage of this prototype cell is close to its theoretical maximum, potential sources of the observed low efficiency are identified, and a suggested path for improvement is discussed. (C) 2009 Elsevier B.V. All rights reserved.
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