An insight on oxide interlayer in organic solar cells: From light absorption and charge collection perspectives

Zhenghui Wu; Bo Wu; Hoi Lam TAM; Fu Rong ZHU

doi:10.1016/j.orgel.2016.01.040

An insight on oxide interlayer in organic solar cells: From light absorption and charge collection perspectives

Zhenghui Wu, Bo Wu, Hoi Lam TAM, Fu Rong ZHU^*

^*Corresponding author for this work

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

31 Citations (Scopus)

Abstract

A comprehensive study of the effect of oxide interlayer on the performance of bulk-heterojunction organic solar cells (OSCs), based on poly[[4,8-bis[(2-ethylhexyl)oxy] benzo [1,2-b:4,5-b'] dithiophene-2,6- diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno [3,4-b] thiophenediyl]] (PTB7): [6,6]-phenyl C71 butyric acid methyl ester (PC₇₀BM) blend system, is carried out by optical simulation, interfacial exciton dissociation and charge collection analyses. It is found that a PTB7:PC₇₀BM blend layer thickness optimized for maximum light absorption in OSCs does not generally give rise to the highest power conversion efficiency (PCE). OSCs, e.g., based on PTB7:PC₇₀BM blend system, can benefit from the oxide interlayer in two ways, (1) to enhance the built-in potential for reducing recombination loss of the photo-generated charges, and (2) to improve charge collection by removal of unfavorable interfacial exciton dissociation. The combined effects result in ∼20% improvement in PCE over an optimized control cell, having an identical layer configuration without an oxide interlayer.

Original language	English
Pages (from-to)	266-272
Number of pages	7
Journal	Organic Electronics
Volume	31
DOIs	https://doi.org/10.1016/j.orgel.2016.01.040
Publication status	Published - 1 Apr 2016

Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Biomaterials
Chemistry(all)
Condensed Matter Physics
Materials Chemistry
Electrical and Electronic Engineering

User-Defined Keywords

Absorption enhancement
Charge collection efficiency
Interfacial exciton dissociation
Oxide/organic hetero-interface
Transient photocurrent

UN SDGs

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

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10.1016/j.orgel.2016.01.040

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title = "An insight on oxide interlayer in organic solar cells: From light absorption and charge collection perspectives",

abstract = "A comprehensive study of the effect of oxide interlayer on the performance of bulk-heterojunction organic solar cells (OSCs), based on poly[[4,8-bis[(2-ethylhexyl)oxy] benzo [1,2-b:4,5-b'] dithiophene-2,6- diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno [3,4-b] thiophenediyl]] (PTB7): [6,6]-phenyl C71 butyric acid methyl ester (PC70BM) blend system, is carried out by optical simulation, interfacial exciton dissociation and charge collection analyses. It is found that a PTB7:PC70BM blend layer thickness optimized for maximum light absorption in OSCs does not generally give rise to the highest power conversion efficiency (PCE). OSCs, e.g., based on PTB7:PC70BM blend system, can benefit from the oxide interlayer in two ways, (1) to enhance the built-in potential for reducing recombination loss of the photo-generated charges, and (2) to improve charge collection by removal of unfavorable interfacial exciton dissociation. The combined effects result in ∼20% improvement in PCE over an optimized control cell, having an identical layer configuration without an oxide interlayer.",

keywords = "Absorption enhancement, Charge collection efficiency, Interfacial exciton dissociation, Oxide/organic hetero-interface, Transient photocurrent",

author = "Zhenghui Wu and Bo Wu and TAM, {Hoi Lam} and ZHU, {Fu Rong}",

note = "Funding Information: This work was supported by Research Grants Council of Hong Kong Special Administrative Region, China , Project No. T23-713/11 , GRF12303114 , National Natural Science Foundation of China (No. 61275037 ), Shenzhen Peacock Project , KQTD20140630110339343 and Hong Kong Baptist University FRG2/14-15/081 . ",

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T2 - From light absorption and charge collection perspectives

AU - Wu, Zhenghui

AU - Wu, Bo

AU - TAM, Hoi Lam

AU - ZHU, Fu Rong

N1 - Funding Information: This work was supported by Research Grants Council of Hong Kong Special Administrative Region, China , Project No. T23-713/11 , GRF12303114 , National Natural Science Foundation of China (No. 61275037 ), Shenzhen Peacock Project , KQTD20140630110339343 and Hong Kong Baptist University FRG2/14-15/081 .

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N2 - A comprehensive study of the effect of oxide interlayer on the performance of bulk-heterojunction organic solar cells (OSCs), based on poly[[4,8-bis[(2-ethylhexyl)oxy] benzo [1,2-b:4,5-b'] dithiophene-2,6- diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno [3,4-b] thiophenediyl]] (PTB7): [6,6]-phenyl C71 butyric acid methyl ester (PC70BM) blend system, is carried out by optical simulation, interfacial exciton dissociation and charge collection analyses. It is found that a PTB7:PC70BM blend layer thickness optimized for maximum light absorption in OSCs does not generally give rise to the highest power conversion efficiency (PCE). OSCs, e.g., based on PTB7:PC70BM blend system, can benefit from the oxide interlayer in two ways, (1) to enhance the built-in potential for reducing recombination loss of the photo-generated charges, and (2) to improve charge collection by removal of unfavorable interfacial exciton dissociation. The combined effects result in ∼20% improvement in PCE over an optimized control cell, having an identical layer configuration without an oxide interlayer.

AB - A comprehensive study of the effect of oxide interlayer on the performance of bulk-heterojunction organic solar cells (OSCs), based on poly[[4,8-bis[(2-ethylhexyl)oxy] benzo [1,2-b:4,5-b'] dithiophene-2,6- diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno [3,4-b] thiophenediyl]] (PTB7): [6,6]-phenyl C71 butyric acid methyl ester (PC70BM) blend system, is carried out by optical simulation, interfacial exciton dissociation and charge collection analyses. It is found that a PTB7:PC70BM blend layer thickness optimized for maximum light absorption in OSCs does not generally give rise to the highest power conversion efficiency (PCE). OSCs, e.g., based on PTB7:PC70BM blend system, can benefit from the oxide interlayer in two ways, (1) to enhance the built-in potential for reducing recombination loss of the photo-generated charges, and (2) to improve charge collection by removal of unfavorable interfacial exciton dissociation. The combined effects result in ∼20% improvement in PCE over an optimized control cell, having an identical layer configuration without an oxide interlayer.

KW - Absorption enhancement

KW - Charge collection efficiency

KW - Interfacial exciton dissociation

KW - Oxide/organic hetero-interface

KW - Transient photocurrent

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DO - 10.1016/j.orgel.2016.01.040

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SN - 1566-1199

VL - 31

SP - 266

EP - 272

JO - Organic Electronics

JF - Organic Electronics

ER -

An insight on oxide interlayer in organic solar cells: From light absorption and charge collection perspectives

Abstract

Scopus Subject Areas

User-Defined Keywords

UN SDGs

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