Abstract
Of the various types of polymerbased, photovoltaic devices designed to date, the most efficient photovoltaic devices, having power conversion efficiencies (PCEs) of 3-4%, were fabricated using a blend of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as the electron-donor and electron-acceptor materials, respectively. 1,2 Soon after the initial reports, P3HT/PCBM-based photovoltaic devices were optimized to achieve PCEs approaching 5%. 3-5 New p-type polymers, which absorb light more broadly in the terrestrial solar radiation spectrum, were needed to increase the PCE of these photovoltaic devices. The HOMO/LUMO energy levels and the charge mobility of new p-type materials should also be optimized as these properties are intimately related to photovoltaic performance, as proposed by Scharber et al. 6
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