The authors have fabricated thin film polymer photovoltaics using 1-(3-methoxy-carbonyl)propyl-1-phenyl-(6,6)C61 within regioregular poly(3-hexylthiophene) bulk heterojunction absorbing layers. Using thermal annealing at temperatures approaching the glass transition temperature, they have examined the formation of nanodomains within the matrix. These domains modify charge transport pathways in such a way as to allow for the efficient use of thicker absorbing layers. This results in a nearly 20% gain in overall performance for this polymer system with external power efficiencies exceeding 6%.
Bibliographical noteFunding Information:
The authors thank AFOSR Grant No. FA9550-04-1-0161, the Korea Institute of Science and Technology (KIST) Contract Nos. 2E19590 and 2E19620, and the Korea Ministry of Information and Communication (MIC) for supporting this work.