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.
| Original language | English |
|---|---|
| Pages (from-to) | 1-8 |
| Number of pages | 8 |
| Journal | Organic Electronics: physics, materials, applications |
| Volume | 16 |
| DOIs | |
| Publication status | Published - Jan 1 2015 |
| Externally published | Yes |
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Keywords
- Charge transfer state
- Electroluminescence
- Open-circuit voltage
- Small-molecule organic photovoltaic device
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Biomaterials
- Chemistry(all)
- Condensed Matter Physics
- Materials Chemistry
- Electrical and Electronic Engineering
Cite this
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; Huang, Bo Yao; Liu, Shun Wei.
In: Organic Electronics: physics, materials, applications, Vol. 16, 01.01.2015, p. 1-8.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The effect of charge transfer state on the open-circuit voltage of small-molecular organic photovoltaic devices
T2 - A comparison between the planar and bulk heterojunctions using electroluminescence characterization
AU - Lee, Chih Chien
AU - Su, Wei Cheng
AU - Chang, Wen Chang
AU - Huang, Bo Yao
AU - Liu, Shun Wei
PY - 2015/1/1
Y1 - 2015/1/1
N2 - 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.
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
KW - Small-molecule organic photovoltaic device
UR - http://www.scopus.com/inward/record.url?scp=84910667081&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84910667081&partnerID=8YFLogxK
U2 - 10.1016/j.orgel.2014.10.040
DO - 10.1016/j.orgel.2014.10.040
M3 - Article
AN - SCOPUS:84910667081
VL - 16
SP - 1
EP - 8
JO - Organic Electronics
JF - Organic Electronics
SN - 1566-1199
ER -