Indium tin oxide nanopillar electrodes in polymer/fullerene solar cells

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Journal titleNanotechnology
Article number85706
SubjectButyric acids; Ethylenedioxythiophenes; Glancing angle deposition; High surface area; Indium tin oxide; Methyl esters; Nano-pillar arrays; Nanoelectrode; Nanoelectrode array; NanoPillar; Nanopillars; Nanostructured electrodes; Organic photovoltaic devices; PEDOT:PSS; Poly (3-hexylthiophene); Porosimetry; Power conversion efficiencies; Series resistances; Surface area; Transparent electrode; Conversion efficiency; Esters; Fatty acids; Indium; Indium compounds; Silicon compounds; Solar cells; Tin; Tin oxides; Electrodes
AbstractUsing high surface area nanostructured electrodes in organic photovoltaic (OPV) devices is a route to enhanced power conversion efficiency. In this paper, indium tin oxide (ITO) and hybrid ITO/SiO2 nanopillars are employed as three-dimensional high surface area transparent electrodes in OPVs. The nanopillar arrays are fabricated via glancing angle deposition (GLAD) and electrochemically modified with nanofibrous PEDOT:PSS (poly(3,4- ethylenedioxythiophene):poly(p-styrenesulfonate)). The structures are found to have increased surface area as characterized by porosimetry. When applied as anodes in polymer/fullerene OPVs (architecture: commercial ITO/GLAD ITO/PEDOT:PSS/P3HT:PCBM/Al, where P3HT is 2,5-diyl-poly(3-hexylthiophene) and PCBM is [6,6]-phenyl-C61-butyric acid methyl ester), the air-processed solar cells incorporating high surface area, PEDOT:PSS-modified ITO nanoelectrode arrays operate with improved performance relative to devices processed identically on unstructured, commercial ITO substrates. The resulting power conversion efficiency is 2.2% which is a third greater than for devices prepared on commercial ITO. To further refine the structure, insulating SiO 2 caps are added above the GLAD ITO nanopillars to produce a hybrid ITO/SiO2 nanoelectrode. OPV devices based on this system show reduced electrical shorting and series resistance, and as a consequence, a further improved power conversion efficiency of 2.5% is recorded. © 2011 IOP Publishing Ltd.
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AffiliationNational Research Council Canada (NRC-CNRC); National Institute for Nanotechnology (NINT-INNT)
Peer reviewedYes
NPARC number21271157
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Record identifier73a78774-52a6-46cc-97c3-40397e14e149
Record created2014-03-24
Record modified2016-05-09
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