Bulk-heterojunction solar cells with enriched polymer contents

Hang Yin; Ka Lok Chiu; Carr Hoi Yi Ho; Harrison Ka Hin Lee; Ho Wa Li; Yuanhang Cheng; Sai Wing Tsang; Shu Kong So

doi:10.1016/j.orgel.2016.10.030

Bulk-heterojunction solar cells with enriched polymer contents

Hang Yin, Ka Lok Chiu, Carr Hoi Yi Ho, Harrison Ka Hin Lee, Ho Wa Li, Yuanhang Cheng, Sai Wing Tsang, Shu Kong So^*

^*Corresponding author for this work

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

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Abstract

In a high performance PTB7:PC₇₁BM bulk-heterojunction (BHJ) solar cell, the commonly optimized polymer:fullerene (D:A) weight ratio is about 1:1.5, when PC₇₁BM is used as the acceptor. This report explores alternative D:A weight ratios. We describe how to enrich the polymer contents of these BHJ solar cells to achieve high power conversion efficiencies (PCEs). The concentration of 1,8-diiodooctane (DIO), a solvent additive for the BHJ precursor solutions, is increased in order to re-optimize the BHJ cells. The PCEs of the re-optimized cells are improved for the PTB7 cells. Detailed charge transport measurements were carried out to examine the polymer-rich BHJs. We observed enhanced hole mobilities for the PTB7 BHJs. Additionally, the electron mobilities are preserved due to the dispersion of fullerene domains by increased DIO concentrations. Two other well-known polymer donors PCDTBT and PDTSTPD have been also investigated, and the improvements of hole mobilities and PCEs can be obtained for both polymer-rich BHJ solar cells.

Original language	English
Pages (from-to)	1-7
Number of pages	7
Journal	Organic Electronics
Volume	40
Early online date	26 Oct 2016
DOIs	https://doi.org/10.1016/j.orgel.2016.10.030
Publication status	Published - Jan 2017

Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Biomaterials
General Chemistry
Condensed Matter Physics
Materials Chemistry
Electrical and Electronic Engineering

User-Defined Keywords

Donor:acceptor ratio
PCE
Charge transport
Admittance spectroscopy

UN SDGs

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

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10.1016/j.orgel.2016.10.030

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title = "Bulk-heterojunction solar cells with enriched polymer contents",

abstract = "In a high performance PTB7:PC71BM bulk-heterojunction (BHJ) solar cell, the commonly optimized polymer:fullerene (D:A) weight ratio is about 1:1.5, when PC71BM is used as the acceptor. This report explores alternative D:A weight ratios. We describe how to enrich the polymer contents of these BHJ solar cells to achieve high power conversion efficiencies (PCEs). The concentration of 1,8-diiodooctane (DIO), a solvent additive for the BHJ precursor solutions, is increased in order to re-optimize the BHJ cells. The PCEs of the re-optimized cells are improved for the PTB7 cells. Detailed charge transport measurements were carried out to examine the polymer-rich BHJs. We observed enhanced hole mobilities for the PTB7 BHJs. Additionally, the electron mobilities are preserved due to the dispersion of fullerene domains by increased DIO concentrations. Two other well-known polymer donors PCDTBT and PDTSTPD have been also investigated, and the improvements of hole mobilities and PCEs can be obtained for both polymer-rich BHJ solar cells.",

keywords = "Donor:acceptor ratio, PCE, Charge transport, Admittance spectroscopy",

author = "Hang Yin and Chiu, {Ka Lok} and Ho, {Carr Hoi Yi} and Lee, {Harrison Ka Hin} and Li, {Ho Wa} and Yuanhang Cheng and Tsang, {Sai Wing} and So, {Shu Kong}",

note = "Funding Information: Supports of this work by the Research Committee of HKBU under RC-ICRS/15-16/4A and the Theme-based Research Scheme (TBRS) Grant #T23-713/11 are gratefully acknowledged. Appendix A ",

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doi = "10.1016/j.orgel.2016.10.030",

language = "English",

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journal = "Organic Electronics",

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T1 - Bulk-heterojunction solar cells with enriched polymer contents

AU - Yin, Hang

AU - Chiu, Ka Lok

AU - Ho, Carr Hoi Yi

AU - Lee, Harrison Ka Hin

AU - Li, Ho Wa

AU - Cheng, Yuanhang

AU - Tsang, Sai Wing

AU - So, Shu Kong

N1 - Funding Information: Supports of this work by the Research Committee of HKBU under RC-ICRS/15-16/4A and the Theme-based Research Scheme (TBRS) Grant #T23-713/11 are gratefully acknowledged. Appendix A

PY - 2017/1

Y1 - 2017/1

N2 - In a high performance PTB7:PC71BM bulk-heterojunction (BHJ) solar cell, the commonly optimized polymer:fullerene (D:A) weight ratio is about 1:1.5, when PC71BM is used as the acceptor. This report explores alternative D:A weight ratios. We describe how to enrich the polymer contents of these BHJ solar cells to achieve high power conversion efficiencies (PCEs). The concentration of 1,8-diiodooctane (DIO), a solvent additive for the BHJ precursor solutions, is increased in order to re-optimize the BHJ cells. The PCEs of the re-optimized cells are improved for the PTB7 cells. Detailed charge transport measurements were carried out to examine the polymer-rich BHJs. We observed enhanced hole mobilities for the PTB7 BHJs. Additionally, the electron mobilities are preserved due to the dispersion of fullerene domains by increased DIO concentrations. Two other well-known polymer donors PCDTBT and PDTSTPD have been also investigated, and the improvements of hole mobilities and PCEs can be obtained for both polymer-rich BHJ solar cells.

AB - In a high performance PTB7:PC71BM bulk-heterojunction (BHJ) solar cell, the commonly optimized polymer:fullerene (D:A) weight ratio is about 1:1.5, when PC71BM is used as the acceptor. This report explores alternative D:A weight ratios. We describe how to enrich the polymer contents of these BHJ solar cells to achieve high power conversion efficiencies (PCEs). The concentration of 1,8-diiodooctane (DIO), a solvent additive for the BHJ precursor solutions, is increased in order to re-optimize the BHJ cells. The PCEs of the re-optimized cells are improved for the PTB7 cells. Detailed charge transport measurements were carried out to examine the polymer-rich BHJs. We observed enhanced hole mobilities for the PTB7 BHJs. Additionally, the electron mobilities are preserved due to the dispersion of fullerene domains by increased DIO concentrations. Two other well-known polymer donors PCDTBT and PDTSTPD have been also investigated, and the improvements of hole mobilities and PCEs can be obtained for both polymer-rich BHJ solar cells.

KW - Donor:acceptor ratio

KW - PCE

KW - Charge transport

KW - Admittance spectroscopy

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DO - 10.1016/j.orgel.2016.10.030

M3 - Journal article

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SN - 1566-1199

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SP - 1

EP - 7

JO - Organic Electronics

JF - Organic Electronics

ER -

Bulk-heterojunction solar cells with enriched polymer contents

Abstract

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