Temperature Dependence of Charge Carrier Generation in Organic Photovoltaics
2015 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 114, no 12, 128701- p.Article in journal (Refereed) Published
The charge generation mechanism in organic photovoltaics is a fundamental yet heavily debated issue. All the generated charges recombine at the open-circuit voltage (VOC), so that investigation of recombined charges at VOC provides a unique approach to understanding charge generation. At low temperatures, we observe a decrease of VOC, which is attributed to reduced charge separation. Comparison between benchmark polymer: fullerene and polymer: polymer blends highlights the critical role of charge delocalization in charge separation and emphasizes the importance of entropy in charge generation.
Place, publisher, year, edition, pages
American Physical Society , 2015. Vol. 114, no 12, 128701- p.
IdentifiersURN: urn:nbn:se:liu:diva-117377DOI: 10.1103/PhysRevLett.114.128701ISI: 000351735600018OAI: oai:DiVA.org:liu-117377DiVA: diva2:807848
Funding Agencies|National Basic Research Program of China [2015CB932200]; Natural Science Foundation of Jiangsu [BK20131413]; National Natural Science Foundation of China ; Swedish Research Council (VR); European Commission Marie Sklodowska-Curie actions; Swedish Energy Agency; Knut and AliceWallenberg foundation (KAW)2015-04-242015-04-242015-04-28