Effect of Thermal Annealing on Charge Transfer States and Charge Trapping in PCDTBT:PC70BM Solar Cells. (8th July 2015)

• Record Type: Journal Article
• Authors: Constantinou, Iordania; Lai, Tzung‐Han; Hsu, Hsien‐Yi; Cheung, Sin‐Hang; Klump, Erik D.; Schanze, Kirk S.; So, Shu‐Kong; So, Franky
• Is Part Of: Advanced Electronic Materials. Volume 1:Number 9(2015:Sep.)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2015-07-08
• Subjects: charge transfer states -- exciton dissociation -- organic solar cells -- photothermal deflection spectroscopy -- thermal annealing; Materials -- Electric properties -- Periodicals; Materials science -- Periodicals; Magnetic materials -- Periodicals; Electronic apparatus and appliances -- Periodicals; 537
• DOI: 10.1002/aelm.201500167
• Languages: English
• ISSNs: 2199-160X

Abstract

Abstract : The impact of thermal annealing on charge transfer (CT) states in poly[N‐9″‐hepta‐decanyl‐2, 7‐carbazole‐ alt ‐5, 5‐(4′, 7′‐di‐2‐thienyl‐2′, 1′, 3′‐benzothiadiazole)] (PCDTBT):[6, 6]‐phenyl C71 butyric acid methyl ester (PC70 BM) bulk heterojunction solar cells is analyzed. Thermal annealing is found to increase the effectiveness of the CT states, facilitating exciton dissociation and carrier generation. An increase in the concentration of deep traps due to annealing is presented using mid‐gap photothermal deflection spectroscopy, resulting in suboptimal overall device performance.