Designing a ternary photovoltaic cell for indoor light harvesting with a power conversion efficiency exceeding 20%

Hang Yin; Johnny Ka Wai Ho; Sin Hang Cheung; Roger Jie Yan; Ka Lok Chiu; Xiaotao Hao; Shu Kong So

doi:10.1039/c8ta01728j

Designing a ternary photovoltaic cell for indoor light harvesting with a power conversion efficiency exceeding 20%

Hang Yin, Johnny Ka Wai Ho, Sin Hang Cheung, Roger Jie Yan, Ka Lok Chiu, Xiaotao Hao, Shu Kong So^*

^*Corresponding author for this work

Department of Physics

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

130 Citations (Scopus)

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Abstract

We used several polymers as the ternary components to demonstrate a ternary strategy to improve the performance of PCDTBT:PC₇₁BM devices under 1 sun and indoor illumination. With a binary bulk-heterojunction (BHJ) of PCDTBT:PC₇₁BM organic photovoltaic (OPV) cell, a power conversion efficiency (PCE) of 16.5% under indoor light sources (300 lux from fluorescence tube) was achieved. However, with a ternary BHJ cell of PCDTBT:PDTSTPD:PC₇₁BM, the PCE can be enhanced to 20.8%. FFs are the primarily improved in these devices. Transport and absorption measurements indicate the origins of the improvements of OPV performance: the ternary BHJ films exhibit enhanced hole mobilities and reduced Urbach energies, indicating that the blending of the PDTSTPD component passivates shallow traps near the band edges of the BHJ films.

Original language	English
Pages (from-to)	8579-8585
Number of pages	7
Journal	Journal of Materials Chemistry A
Volume	6
Issue number	18
Early online date	10 Apr 2018
DOIs	https://doi.org/10.1039/c8ta01728j
Publication status	Published - 14 May 2018

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title = "Designing a ternary photovoltaic cell for indoor light harvesting with a power conversion efficiency exceeding 20%",

abstract = "We used several polymers as the ternary components to demonstrate a ternary strategy to improve the performance of PCDTBT:PC71BM devices under 1 sun and indoor illumination. With a binary bulk-heterojunction (BHJ) of PCDTBT:PC71BM organic photovoltaic (OPV) cell, a power conversion efficiency (PCE) of 16.5% under indoor light sources (300 lux from fluorescence tube) was achieved. However, with a ternary BHJ cell of PCDTBT:PDTSTPD:PC71BM, the PCE can be enhanced to 20.8%. FFs are the primarily improved in these devices. Transport and absorption measurements indicate the origins of the improvements of OPV performance: the ternary BHJ films exhibit enhanced hole mobilities and reduced Urbach energies, indicating that the blending of the PDTSTPD component passivates shallow traps near the band edges of the BHJ films.",

author = "Hang Yin and Ho, {Johnny Ka Wai} and Cheung, {Sin Hang} and Yan, {Roger Jie} and Chiu, {Ka Lok} and Xiaotao Hao and So, {Shu Kong}",

note = "Funding Information: Support for this research by the RGC of Hong Kong and NSFC of China under grant # N_HKBU202/16 is gratefully acknowledged. X. T. H. acknowledges the National Natural Science Foundation of China for the NSFC/RGC project (no. 61631166001.)",

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doi = "10.1039/c8ta01728j",

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AU - Yin, Hang

AU - Ho, Johnny Ka Wai

AU - Cheung, Sin Hang

AU - Yan, Roger Jie

AU - Chiu, Ka Lok

AU - Hao, Xiaotao

AU - So, Shu Kong

N1 - Funding Information: Support for this research by the RGC of Hong Kong and NSFC of China under grant # N_HKBU202/16 is gratefully acknowledged. X. T. H. acknowledges the National Natural Science Foundation of China for the NSFC/RGC project (no. 61631166001.)

PY - 2018/5/14

Y1 - 2018/5/14

N2 - We used several polymers as the ternary components to demonstrate a ternary strategy to improve the performance of PCDTBT:PC71BM devices under 1 sun and indoor illumination. With a binary bulk-heterojunction (BHJ) of PCDTBT:PC71BM organic photovoltaic (OPV) cell, a power conversion efficiency (PCE) of 16.5% under indoor light sources (300 lux from fluorescence tube) was achieved. However, with a ternary BHJ cell of PCDTBT:PDTSTPD:PC71BM, the PCE can be enhanced to 20.8%. FFs are the primarily improved in these devices. Transport and absorption measurements indicate the origins of the improvements of OPV performance: the ternary BHJ films exhibit enhanced hole mobilities and reduced Urbach energies, indicating that the blending of the PDTSTPD component passivates shallow traps near the band edges of the BHJ films.

AB - We used several polymers as the ternary components to demonstrate a ternary strategy to improve the performance of PCDTBT:PC71BM devices under 1 sun and indoor illumination. With a binary bulk-heterojunction (BHJ) of PCDTBT:PC71BM organic photovoltaic (OPV) cell, a power conversion efficiency (PCE) of 16.5% under indoor light sources (300 lux from fluorescence tube) was achieved. However, with a ternary BHJ cell of PCDTBT:PDTSTPD:PC71BM, the PCE can be enhanced to 20.8%. FFs are the primarily improved in these devices. Transport and absorption measurements indicate the origins of the improvements of OPV performance: the ternary BHJ films exhibit enhanced hole mobilities and reduced Urbach energies, indicating that the blending of the PDTSTPD component passivates shallow traps near the band edges of the BHJ films.

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DO - 10.1039/c8ta01728j

M3 - Journal article

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SN - 2050-7488

VL - 6

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EP - 8585

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

IS - 18

ER -

Designing a ternary photovoltaic cell for indoor light harvesting with a power conversion efficiency exceeding 20%

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