Abstract
Two types of carboxylic acid functionalized fullerence derivatives, 4-(2-ethylhexyloxy)-[6,6]-phenyl C61-butyric acid (p-EHO-PCBA) and bis-4-(2-ethylhexyloxy)-[6,6]-phenyl C61-butyric acid (bis-p-EHO-PCBA), were synthesized and investigated as an interfacial layer for inverted polymer solar cells (iPSCs). The -COOH groups on the PCBAs chemisorb to inorganic metal oxide (TiOX), generating fullerene-based self-assembled monolayers (FSAMs). The devices with the mono- and bis-FSAMs exhibited substantially lower series resistance (RS) values of 2.10 Ω cm2 and 1.46 Ω cm2, compared to that (4.15 Ω cm2) of the unmodified device. The TiOX films modified with mono- and bis-FSAMs showed higher contact angles of 50 and 91, respectively, than that of the pristine TiOX film (33). The increased contact angles were attributed to the enhanced hydrophobicity, improving the wetting properties with the organic photoactive layer. In addition, a comparison of device characteristics with electroactive FSAMs and non-electroactive benzoic acid SAMs clearly indicates that the FSAMs may suggest an additional pathway for photo-induced charge transfer and charge collection to ITO. After surface modification with FSAMs, the short-circuit current density (J SC) and fill factor (FF) values increased substantially. The iPSCs based on poly(5,6-bis(octyloxy)-4-(thiophen-2-l)benzo[c][1,2,5]thiadiazole) (PTBT) and [6,6]phenyl-C61-butyric acid methyl ester (PCBM) as an active layer showed remarkably improved power conversion efficiency up to 5.13% through incorporation of the FSAMs-based interfacial layer.
| Original language | English |
|---|---|
| Pages (from-to) | 3138-3145 |
| Number of pages | 8 |
| Journal | Organic Electronics: physics, materials, applications |
| Volume | 14 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 2013 Aug 19 |
| Externally published | Yes |
Fingerprint
Keywords
- Fullerene
- Interfacial layer
- Inverted polymer solar cells
- Self-assembled monolayer
- Surface modification
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Biomaterials
- Chemistry(all)
- Condensed Matter Physics
- Materials Chemistry
- Electrical and Electronic Engineering
Cite this
Acid-functionalized fullerenes used as interfacial layer materials in inverted polymer solar cells. / Choi, Hyosung; Lee, Junghoon; Lee, Wonho; Ko, Seo Jin; Yang, Renqiang; Lee, Jeong Chul; Woo, Han Young; Yang, Changduk; Kim, Jin Young.
In: Organic Electronics: physics, materials, applications, Vol. 14, No. 11, 19.08.2013, p. 3138-3145.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Acid-functionalized fullerenes used as interfacial layer materials in inverted polymer solar cells
AU - Choi, Hyosung
AU - Lee, Junghoon
AU - Lee, Wonho
AU - Ko, Seo Jin
AU - Yang, Renqiang
AU - Lee, Jeong Chul
AU - Woo, Han Young
AU - Yang, Changduk
AU - Kim, Jin Young
PY - 2013/8/19
Y1 - 2013/8/19
N2 - Two types of carboxylic acid functionalized fullerence derivatives, 4-(2-ethylhexyloxy)-[6,6]-phenyl C61-butyric acid (p-EHO-PCBA) and bis-4-(2-ethylhexyloxy)-[6,6]-phenyl C61-butyric acid (bis-p-EHO-PCBA), were synthesized and investigated as an interfacial layer for inverted polymer solar cells (iPSCs). The -COOH groups on the PCBAs chemisorb to inorganic metal oxide (TiOX), generating fullerene-based self-assembled monolayers (FSAMs). The devices with the mono- and bis-FSAMs exhibited substantially lower series resistance (RS) values of 2.10 Ω cm2 and 1.46 Ω cm2, compared to that (4.15 Ω cm2) of the unmodified device. The TiOX films modified with mono- and bis-FSAMs showed higher contact angles of 50 and 91, respectively, than that of the pristine TiOX film (33). The increased contact angles were attributed to the enhanced hydrophobicity, improving the wetting properties with the organic photoactive layer. In addition, a comparison of device characteristics with electroactive FSAMs and non-electroactive benzoic acid SAMs clearly indicates that the FSAMs may suggest an additional pathway for photo-induced charge transfer and charge collection to ITO. After surface modification with FSAMs, the short-circuit current density (J SC) and fill factor (FF) values increased substantially. The iPSCs based on poly(5,6-bis(octyloxy)-4-(thiophen-2-l)benzo[c][1,2,5]thiadiazole) (PTBT) and [6,6]phenyl-C61-butyric acid methyl ester (PCBM) as an active layer showed remarkably improved power conversion efficiency up to 5.13% through incorporation of the FSAMs-based interfacial layer.
AB - Two types of carboxylic acid functionalized fullerence derivatives, 4-(2-ethylhexyloxy)-[6,6]-phenyl C61-butyric acid (p-EHO-PCBA) and bis-4-(2-ethylhexyloxy)-[6,6]-phenyl C61-butyric acid (bis-p-EHO-PCBA), were synthesized and investigated as an interfacial layer for inverted polymer solar cells (iPSCs). The -COOH groups on the PCBAs chemisorb to inorganic metal oxide (TiOX), generating fullerene-based self-assembled monolayers (FSAMs). The devices with the mono- and bis-FSAMs exhibited substantially lower series resistance (RS) values of 2.10 Ω cm2 and 1.46 Ω cm2, compared to that (4.15 Ω cm2) of the unmodified device. The TiOX films modified with mono- and bis-FSAMs showed higher contact angles of 50 and 91, respectively, than that of the pristine TiOX film (33). The increased contact angles were attributed to the enhanced hydrophobicity, improving the wetting properties with the organic photoactive layer. In addition, a comparison of device characteristics with electroactive FSAMs and non-electroactive benzoic acid SAMs clearly indicates that the FSAMs may suggest an additional pathway for photo-induced charge transfer and charge collection to ITO. After surface modification with FSAMs, the short-circuit current density (J SC) and fill factor (FF) values increased substantially. The iPSCs based on poly(5,6-bis(octyloxy)-4-(thiophen-2-l)benzo[c][1,2,5]thiadiazole) (PTBT) and [6,6]phenyl-C61-butyric acid methyl ester (PCBM) as an active layer showed remarkably improved power conversion efficiency up to 5.13% through incorporation of the FSAMs-based interfacial layer.
KW - Fullerene
KW - Interfacial layer
KW - Inverted polymer solar cells
KW - Self-assembled monolayer
KW - Surface modification
UR - http://www.scopus.com/inward/record.url?scp=84885955631&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84885955631&partnerID=8YFLogxK
U2 - 10.1016/j.orgel.2013.07.027
DO - 10.1016/j.orgel.2013.07.027
M3 - Article
AN - SCOPUS:84885955631
VL - 14
SP - 3138
EP - 3145
JO - Organic Electronics: physics, materials, applications
JF - Organic Electronics: physics, materials, applications
SN - 1566-1199
IS - 11
ER -