The effect of charge transfer state on the open-circuit voltage of small-molecular organic photovoltaic devices: A comparison between the planar and bulk heterojunctions using electroluminescence characterization

Chih Chien Lee; Wei Cheng Su; Wen Chang Chang; Bo Yao Huang; Shun Wei Liu

doi:10.1016/j.orgel.2014.10.040

The effect of charge transfer state on the open-circuit voltage of small-molecular organic photovoltaic devices: A comparison between the planar and bulk heterojunctions using electroluminescence characterization

Chih Chien Lee
, Wei Cheng Su
, Wen Chang Chang
, Bo Yao Huang
, Shun Wei Liu

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

19 Citations (Scopus)

Abstract

This work studies the open-circuit voltage (V_OC) of planar and bulk heterojunction organic photovoltaic (OPV) devices by means of electroluminescent (EL) technique to resolve the charge transfer (CT) states between donor and acceptor. The OPV devices containing a small part of bulk heterojunction increases the V_OC as a result of the enhanced CT process as compared with a complete planar structure. Red shift of the CT charge transfer was observed by increasing the bulk volume, which indicates the increased degree of interaction between both molecules and excitons. By characterizing the EL spectra of OPV devices and relating them to the CT absorption, the interfacial property between the donor and acceptor is shown to be crucial for determining the V_OC in small-molecule OPV devices. Detailed analysis of the energetic loss was also used to interpret the V_OC under the effect of CT states.

Original language	English
Pages (from-to)	1-8
Number of pages	8
Journal	Organic Electronics: physics, materials, applications
Volume	16
DOIs	https://doi.org/10.1016/j.orgel.2014.10.040
Publication status	Published - Jan 1 2015
Externally published	Yes

UN SDGs

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

SDG 7 Affordable and Clean Energy

Keywords

Charge transfer state
Electroluminescence
Open-circuit voltage
Small-molecule organic photovoltaic device

ASJC Scopus subject areas

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

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10.1016/j.orgel.2014.10.040

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Lee, C. C., Su, W. C., Chang, W. C., Huang, B. Y., & Liu, S. W. (2015). The effect of charge transfer state on the open-circuit voltage of small-molecular organic photovoltaic devices: A comparison between the planar and bulk heterojunctions using electroluminescence characterization. Organic Electronics: physics, materials, applications, 16, 1-8. https://doi.org/10.1016/j.orgel.2014.10.040

The effect of charge transfer state on the open-circuit voltage of small-molecular organic photovoltaic devices: A comparison between the planar and bulk heterojunctions using electroluminescence characterization. / Lee, Chih Chien; Su, Wei Cheng; Chang, Wen Chang et al.
In: Organic Electronics: physics, materials, applications, Vol. 16, 01.01.2015, p. 1-8.

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

Lee, CC, Su, WC, Chang, WC, Huang, BY & Liu, SW 2015, 'The effect of charge transfer state on the open-circuit voltage of small-molecular organic photovoltaic devices: A comparison between the planar and bulk heterojunctions using electroluminescence characterization', Organic Electronics: physics, materials, applications, vol. 16, pp. 1-8. https://doi.org/10.1016/j.orgel.2014.10.040

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title = "The effect of charge transfer state on the open-circuit voltage of small-molecular organic photovoltaic devices: A comparison between the planar and bulk heterojunctions using electroluminescence characterization",

abstract = "This work studies the open-circuit voltage (VOC) of planar and bulk heterojunction organic photovoltaic (OPV) devices by means of electroluminescent (EL) technique to resolve the charge transfer (CT) states between donor and acceptor. The OPV devices containing a small part of bulk heterojunction increases the VOC as a result of the enhanced CT process as compared with a complete planar structure. Red shift of the CT charge transfer was observed by increasing the bulk volume, which indicates the increased degree of interaction between both molecules and excitons. By characterizing the EL spectra of OPV devices and relating them to the CT absorption, the interfacial property between the donor and acceptor is shown to be crucial for determining the VOC in small-molecule OPV devices. Detailed analysis of the energetic loss was also used to interpret the VOC under the effect of CT states.",

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AU - Chang, Wen Chang

AU - Huang, Bo Yao

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AB - This work studies the open-circuit voltage (VOC) of planar and bulk heterojunction organic photovoltaic (OPV) devices by means of electroluminescent (EL) technique to resolve the charge transfer (CT) states between donor and acceptor. The OPV devices containing a small part of bulk heterojunction increases the VOC as a result of the enhanced CT process as compared with a complete planar structure. Red shift of the CT charge transfer was observed by increasing the bulk volume, which indicates the increased degree of interaction between both molecules and excitons. By characterizing the EL spectra of OPV devices and relating them to the CT absorption, the interfacial property between the donor and acceptor is shown to be crucial for determining the VOC in small-molecule OPV devices. Detailed analysis of the energetic loss was also used to interpret the VOC under the effect of CT states.

KW - Charge transfer state

KW - Electroluminescence

KW - Open-circuit voltage

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The effect of charge transfer state on the open-circuit voltage of small-molecular organic photovoltaic devices: A comparison between the planar and bulk heterojunctions using electroluminescence characterization

Abstract

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Keywords

ASJC Scopus subject areas

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