Sequential processing: Control of nanomorphology in bulk heterojunction solar cells

Dong Hwan Wang; Ji Sun Moon; Jason Seifter; Jang Jo; Jong Hyeok Park; O. Ok Park; Alan J. Heeger

doi:10.1021/nl202320r

Sequential processing: Control of nanomorphology in bulk heterojunction solar cells

Dong Hwan Wang, Ji Sun Moon, Jason Seifter, Jang Jo, Jong Hyeok Park, O. Ok Park, Alan J. Heeger

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

106 Citations (Scopus)

Abstract

Bulk heterojunction organic photovoltaic devices based on poly[N-9′′-hepta-decanyl-2,7-carbazole-alt-5,5-(4′, 7′-di-2-thienyl-2′,1′,3′-benzothiadiazole) (PCDTBT)/[6,6]-phenyl C₇₀ butyric acid methyl ester (PC ₇₀BM) can be successfully fabricated by a sequential solution deposition process. When the top layer is deposited from an appropriate cosolvent, the PC₇₀BM penetrates a predeposited bottom layer of PCDTBT during the spin-casting process, resulting in an interdiffused structure with a layer-evolved bulk heterojunction (LE-BHJ) nanomorphology. The PCDTBT:PC₇₀BM LE-BHJ solar cells prepared with an optimized cosolvent ratio have comparable power conversion efficiency to the conventional BHJ solar cells. The nanomorphology of the optimized PCDTBT:PC₇₀BM LE-BHJ mixture was found to have better vertical connectivity than the conventional BHJ material.

Original language	English
Pages (from-to)	3163-3168
Number of pages	6
Journal	Nano letters
Volume	11
Issue number	8
DOIs	https://doi.org/10.1021/nl202320r
Publication status	Published - 2011 Aug 10

All Science Journal Classification (ASJC) codes

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

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title = "Sequential processing: Control of nanomorphology in bulk heterojunction solar cells",

abstract = "Bulk heterojunction organic photovoltaic devices based on poly[N-9′′-hepta-decanyl-2,7-carbazole-alt-5,5-(4′, 7′-di-2-thienyl-2′,1′,3′-benzothiadiazole) (PCDTBT)/[6,6]-phenyl C70 butyric acid methyl ester (PC 70BM) can be successfully fabricated by a sequential solution deposition process. When the top layer is deposited from an appropriate cosolvent, the PC70BM penetrates a predeposited bottom layer of PCDTBT during the spin-casting process, resulting in an interdiffused structure with a layer-evolved bulk heterojunction (LE-BHJ) nanomorphology. The PCDTBT:PC70BM LE-BHJ solar cells prepared with an optimized cosolvent ratio have comparable power conversion efficiency to the conventional BHJ solar cells. The nanomorphology of the optimized PCDTBT:PC70BM LE-BHJ mixture was found to have better vertical connectivity than the conventional BHJ material.",

author = "Wang, {Dong Hwan} and Moon, {Ji Sun} and Jason Seifter and Jang Jo and Park, {Jong Hyeok} and Park, {O. Ok} and Heeger, {Alan J.}",

year = "2011",

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T2 - Control of nanomorphology in bulk heterojunction solar cells

AU - Wang, Dong Hwan

AU - Moon, Ji Sun

AU - Seifter, Jason

AU - Jo, Jang

AU - Park, Jong Hyeok

AU - Park, O. Ok

AU - Heeger, Alan J.

PY - 2011/8/10

Y1 - 2011/8/10

N2 - Bulk heterojunction organic photovoltaic devices based on poly[N-9′′-hepta-decanyl-2,7-carbazole-alt-5,5-(4′, 7′-di-2-thienyl-2′,1′,3′-benzothiadiazole) (PCDTBT)/[6,6]-phenyl C70 butyric acid methyl ester (PC 70BM) can be successfully fabricated by a sequential solution deposition process. When the top layer is deposited from an appropriate cosolvent, the PC70BM penetrates a predeposited bottom layer of PCDTBT during the spin-casting process, resulting in an interdiffused structure with a layer-evolved bulk heterojunction (LE-BHJ) nanomorphology. The PCDTBT:PC70BM LE-BHJ solar cells prepared with an optimized cosolvent ratio have comparable power conversion efficiency to the conventional BHJ solar cells. The nanomorphology of the optimized PCDTBT:PC70BM LE-BHJ mixture was found to have better vertical connectivity than the conventional BHJ material.

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