Effect of Thermal Annealing on Charge Transfer States and Charge Trapping in PCDTBT:PC70BM Solar Cells

Iordania Constantinou; Tzung-Han Lai; Hsien-Yi Hsu; Sin-Hang Cheung; Erik D. Klump; Kirk S. Schanze; Shu-Kong So; Franky So

doi:10.1002/aelm.201500167

Effect of Thermal Annealing on Charge Transfer States and Charge Trapping in PCDTBT:PC₇₀BM Solar Cells

Iordania Constantinou, Tzung-Han Lai, Hsien-Yi Hsu, Sin-Hang Cheung, Erik D. Klump, Kirk S. Schanze, Shu-Kong So, Franky So^*

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › peer-review

35 Citations (Scopus)

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 (PC70BM) 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.

Original language	English
Article number	1500167
Journal	Advanced Electronic Materials
Volume	1
Issue number	9
Early online date	8 Jul 2015
DOIs	https://doi.org/10.1002/aelm.201500167
Publication status	Published - Sept 2015

User-Defined Keywords

charge transfer states
exciton dissociation
organic solar cells
photothermal deflection spectroscopy
thermal annealing

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This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1002/aelm.201500167

Cite this

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title = "Effect of Thermal Annealing on Charge Transfer States and Charge Trapping in PCDTBT:PC70BM Solar Cells",

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 (PC70BM) 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.",

keywords = "charge transfer states, exciton dissociation, organic solar cells, photothermal deflection spectroscopy, thermal annealing",

author = "Iordania Constantinou and Tzung-Han Lai and Hsien-Yi Hsu and Sin-Hang Cheung and Klump, {Erik D.} and Schanze, {Kirk S.} and Shu-Kong So and Franky So",

note = "Publisher copyright: {\textcopyright} 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

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T1 - Effect of Thermal Annealing on Charge Transfer States and Charge Trapping in PCDTBT:PC70BM Solar Cells

AU - Constantinou, Iordania

AU - Lai, Tzung-Han

AU - Hsu, Hsien-Yi

AU - Cheung, Sin-Hang

AU - Klump, Erik D.

AU - Schanze, Kirk S.

AU - So, Shu-Kong

AU - So, Franky

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AB - 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 (PC70BM) 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.

KW - charge transfer states

KW - exciton dissociation

KW - organic solar cells

KW - photothermal deflection spectroscopy

KW - thermal annealing

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