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“Thieno[3,2-b]thiophene-diketopyrrolopyrrole containing polymers for inverted solar cells devices with high short circuit currents,” H. Bronstein, E. Collado-Fregoso, A. Hadipour, Y.W. Soon, Z. Huang, S.D. Dimitrov, R.S. Ashraf, B.P. Rand, S.E. Watkins, P.S. Tuladhar, I. Meager, J.R. Durrant, I. McCulloch, Adv. Funct. Mater., 23, 5647 (2013).