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. 2009 Dec;9(12):4250-7.
doi: 10.1021/nl9024853.

Visible to near-infrared light harvesting in TiO2 nanotube array-P3HT based heterojunction solar cells

Gopal K Mor  1 , Sanghoon Kim, Maggie Paulose, Oomman K Varghese, Karthik Shankar, James Basham, Craig A Grimes
Affiliations

Visible to near-infrared light harvesting in TiO2 nanotube array-P3HT based heterojunction solar cells

Gopal K Mor et al. Nano Lett. 2009 Dec.

Abstract

The development of high-efficiency solid-state excitonic photovoltaic solar cells compatible with solution processing techniques is a research area of intense interest, with the poor optical harvesting in the red and near-IR (NIR) portion of the solar spectrum a significant limitation to device performance. Herein we present a solid-state solar cell design, consisting of TiO(2) nanotube arrays vertically oriented from the FTO-coated glass substrate, sensitized with unsymmetrical squaraine dye (SQ-1) that absorbs in the red and NIR portion of solar spectrum, and which are uniformly infiltrated with p-type regioregular poly(3-hexylthiophene-2,5-diyl) (P3HT) that absorbs higher energy photons. Our solid-state solar cells exhibit broad, near-UV to NIR, spectral response with external quantum yields of up to 65%. Under UV filtered AM 1.5G of 90 mW/cm(2) intensity we achieve typical device photoconversion efficiencies of 3.2%, with champion device efficiencies of 3.8%.

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