TY - JOUR AU - Paul Haney C2 - Applied Physics Letters DA - 2011-07-21 LA - en M1 - 110 PB - Applied Physics Letters PY - 2011 TI - Organic photovoltaic bulk heterojunctions with spatially varying composition. UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=908321 ER -