Three‐Dimensional Nanostructured Indium‐Tin‐Oxide Electrodes for Enhanced Performance of Bulk Heterojunction Organic Solar Cells |
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| Authors: | Hyunah Kwon Juyoung Ham Dong Yeong Kim Seung Jae Oh Subin Lee Sang Ho Oh E Fred Schubert Kyung‐Geun Lim Tae‐Woo Lee Sungjun Kim Jong‐Lam Lee Jong Kyu Kim |
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| Affiliation: | 1. Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, South Korea;2. Department for Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA |
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| Abstract: | A three‐dimensional indium tin oxide (ITO) nanohelix (NH) array is presented as a multifunctional electrode for bulk heterojunction organic solar cells for simultaneously improving light absorption and charge transport from the active region to the anode. It is shown that the ITO NH array, which is easily fabricated using an oblique‐angle‐deposition technique, acts as an effective antireflection coating as well as a light‐scattering layer, resulting in much enhanced light harvesting. Furthermore, the larger interfacial area between the electrode and the active layer, together with the enhanced carrier mobility through highly conductive ITO NH facilitate transport and collection of charge carriers. The optical and electrical improvements enabled by the ITO NH electrode result in a 10% increase in short‐circuit current density and power‐conversion efficiency of the solar cells. |
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| Keywords: | nanohelix arrays bulk heterojunction solar cells organic solar cells |
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