The effect of a concentration graded cathode for organic solar cells

Ji Hye Jeon; Hang Ken Lee; Dong Hwan Wang; Soon Mi Park; Jeong Won Kim; Kyung Joong Kim; Jong Hyeok Park; O. Ok Park

doi:10.1016/j.solmat.2011.04.026

The effect of a concentration graded cathode for organic solar cells

Ji Hye Jeon, Hang Ken Lee, Dong Hwan Wang, Soon Mi Park, Jeong Won Kim, Kyung Joong Kim, Jong Hyeok Park, O. Ok Park

Department of Chemical and Biomolecular Engineering

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

8 Citations (Scopus)

Abstract

We present the effects of a concentration graded Li:Al cathode when it is made by one-step evaporation method using single alloy sources on the performance of organic solar cells. The concentration profile of the Li:Al cathode and related interface energy levels were investigated by means of secondary ion mass spectroscopy and ultraviolet photoelectron spectroscopy, in comparison with those of a common Al cathode. The results indicate that interfacial lithium accumulation introduces a cascade decrease of the work function (WF) of the cathode. The WF graded cathode applied to bulk heterojunction solar cells resulted in increased short circuit current and power conversion efficiency. Furthermore, the Li:Al cathode avoids the formation of interface AlC complex, which may cause disruption of electron transport.

Original language	English
Pages (from-to)	2443-2447
Number of pages	5
Journal	Solar Energy Materials and Solar Cells
Volume	95
Issue number	8
DOIs	https://doi.org/10.1016/j.solmat.2011.04.026
Publication status	Published - 2011 Aug

Bibliographical note

Funding Information:
This research was supported by a WCU Grant (R32-2008-000-10142-0) and ERC Program ( R11-2007-045-01002-0(2009 )) from MEST. J. H. Park acknowledges Research Programs through the NRF Grant funded by MEST ( 2011-0006268 and Future-based Technology Development Program (Nano Fields) ( 2010-0029321 )).

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films

UN SDGs

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

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10.1016/j.solmat.2011.04.026

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title = "The effect of a concentration graded cathode for organic solar cells",

abstract = "We present the effects of a concentration graded Li:Al cathode when it is made by one-step evaporation method using single alloy sources on the performance of organic solar cells. The concentration profile of the Li:Al cathode and related interface energy levels were investigated by means of secondary ion mass spectroscopy and ultraviolet photoelectron spectroscopy, in comparison with those of a common Al cathode. The results indicate that interfacial lithium accumulation introduces a cascade decrease of the work function (WF) of the cathode. The WF graded cathode applied to bulk heterojunction solar cells resulted in increased short circuit current and power conversion efficiency. Furthermore, the Li:Al cathode avoids the formation of interface AlC complex, which may cause disruption of electron transport.",

author = "Jeon, {Ji Hye} and Lee, {Hang Ken} and Wang, {Dong Hwan} and Park, {Soon Mi} and Kim, {Jeong Won} and Kim, {Kyung Joong} and Park, {Jong Hyeok} and Park, {O. Ok}",

note = "Funding Information: This research was supported by a WCU Grant (R32-2008-000-10142-0) and ERC Program ( R11-2007-045-01002-0(2009 )) from MEST. J. H. Park acknowledges Research Programs through the NRF Grant funded by MEST ( 2011-0006268 and Future-based Technology Development Program (Nano Fields) ( 2010-0029321 )).",

year = "2011",

month = aug,

doi = "10.1016/j.solmat.2011.04.026",

language = "English",

volume = "95",

pages = "2443--2447",

journal = "Solar Energy Materials and Solar Cells",

issn = "0927-0248",

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TY - JOUR

T1 - The effect of a concentration graded cathode for organic solar cells

AU - Jeon, Ji Hye

AU - Lee, Hang Ken

AU - Wang, Dong Hwan

AU - Park, Soon Mi

AU - Kim, Jeong Won

AU - Kim, Kyung Joong

AU - Park, Jong Hyeok

AU - Park, O. Ok

N1 - Funding Information: This research was supported by a WCU Grant (R32-2008-000-10142-0) and ERC Program ( R11-2007-045-01002-0(2009 )) from MEST. J. H. Park acknowledges Research Programs through the NRF Grant funded by MEST ( 2011-0006268 and Future-based Technology Development Program (Nano Fields) ( 2010-0029321 )).

PY - 2011/8

Y1 - 2011/8

N2 - We present the effects of a concentration graded Li:Al cathode when it is made by one-step evaporation method using single alloy sources on the performance of organic solar cells. The concentration profile of the Li:Al cathode and related interface energy levels were investigated by means of secondary ion mass spectroscopy and ultraviolet photoelectron spectroscopy, in comparison with those of a common Al cathode. The results indicate that interfacial lithium accumulation introduces a cascade decrease of the work function (WF) of the cathode. The WF graded cathode applied to bulk heterojunction solar cells resulted in increased short circuit current and power conversion efficiency. Furthermore, the Li:Al cathode avoids the formation of interface AlC complex, which may cause disruption of electron transport.

AB - We present the effects of a concentration graded Li:Al cathode when it is made by one-step evaporation method using single alloy sources on the performance of organic solar cells. The concentration profile of the Li:Al cathode and related interface energy levels were investigated by means of secondary ion mass spectroscopy and ultraviolet photoelectron spectroscopy, in comparison with those of a common Al cathode. The results indicate that interfacial lithium accumulation introduces a cascade decrease of the work function (WF) of the cathode. The WF graded cathode applied to bulk heterojunction solar cells resulted in increased short circuit current and power conversion efficiency. Furthermore, the Li:Al cathode avoids the formation of interface AlC complex, which may cause disruption of electron transport.

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DO - 10.1016/j.solmat.2011.04.026

M3 - Article

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SN - 0927-0248

VL - 95

SP - 2443

EP - 2447

JO - Solar Energy Materials and Solar Cells

JF - Solar Energy Materials and Solar Cells

IS - 8

ER -

The effect of a concentration graded cathode for organic solar cells

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

UN SDGs

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