A new air-stable triarylamine-based amorphous polymer, TSP-T11, which consists of thiophene and triarylamine units, can be successfully utilized to fabricate bulk-heterojunction organic photovoltaics (OPVs) using PC(60)BM or PC(70)BM as acceptor materials. The highest level of performance of OPVs optimized at TSP-T11:PC(70)BM (weight ratios of 1:4) with thicknesses of 68 nm exhibited an open circuit voltage (V(oc)) of 0.75 V, a short circuit current (J(sc)) of 8.03 mA cm(-2), and a power-conversion efficiency (PCE) of 2.22% under simulated air mass 1.5 solar irradiation at 100 mW cm(-2). Although TSP-T11 has a lower hole mobility (1.5 x 10(-4) cm(2) V(-1) s(-1)) than P3HT, the use of amorphous film of TSP-T11 as a donor material for OPVs offers advantages over the use of polycrystalline film of P3HT in terms of its air-stability and pinhole-free homogeneous morphology. (C) 2011 Elsevier B.V. All rights reserved.