Photovoltaic properties of polymer nanocomposites
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abstract
Due to its excellent carrier mobility, large surface area and huge current carrying ability, single wall carbon nanotube (SWNT) has been used to increase the performance of polymer solar cells (PSCs) through elevating the PSCs photocurrent and photovoltaic (PV) film crystallinity. However, upon doping mixture of metallic (m-) and semiconducting (s-) SWNT, the former one can serve as free carrier recombination sites, resulting in low photocurrent. In this paper, semiconducting single-walled carbon nanotubes (s-SWNTs) and poly (3-hexylthiophene) (P3HT) composites were fabricated through spin-coating, and their photovoltaic properties are investigated. The energy transfer and carrier transport mechanisms in the composites are investigated experimentally by optical absorption spectroscopy, photoluminescence (PL) spectroscopy, and carrier mobility measurements. The s-SWNT/P3HT composites show reduced non-radiative recombination rate compared with the metallic SWNT/P3HT hybrid under solar irradiation, indicating that the formation of a type-II heterojunction between s-SWNT and conjugated polymer makes s-SWNT a promising electron acceptor and charge transport medium for bulk heterojunction solar cells.
