학술논문
Microstructural modification of polycarbazole-based polymeric solar cells by thermal annealing
Document Type
Conference
Source
2014 21st International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD) Active-Matrix Flatpanel Displays and Devices (AM-FPD), 2014 21st International Workshop on. :249-252 Jul, 2014
Subject
Language
Abstract
Blended thin films were thermal-annealed at various temperatures (T A ) to serve as active layers in polymeric solar cells. The films were composed of poly[N-9′-heptadecanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) and [6,6]-phenyl-C71-butyric acid methyl ester and their microstructural features were examined through joint spectroscopy and microscopy. After they were thermal-annealed at a T A below but close to the glass transition temperature of PCDTBT, their various properties improved, including absorbance, molecular ordering, coherence length of PCDTBT, homogeneity of PCDTBT chain conformations, and two-phase pathways. Efficient charge transport and suppressed charge recombination occurred in the modified thin films, resulting in an enhancement of the power conversion efficiency of the corresponding devices.