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Reducing Trap-Assisted Recombination in Small Organic Molecule-Based Photovoltaics by the Addition of a Conjugated Block Copolymer
- Reducing Trap-Assisted Recombination in Small Organic Molecule-Based Photovoltaics by the Addition of a Conjugated Block Copolymer
- Cho, Kyuwan; Kim, Jinseck; Yoon, So Yeon; Ryu, Ka Yeon; Jang, Song-Rim; Lim, Bogyu; Kim, Kyungkon
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- MACROMOLECULAR RAPID COMMUNICATIONS
- MACROMOLECULAR RAPID COMMUNICATIONS vol. 39, no. 5
- organic solar cells; organic solar cell stability; small molecule organic solar cells; ternary organic solar cells
- WILEY-V C H VERLAG GMBH
- SCIE; SCOPUS
- Document Type
- The performance of organic photovoltaics (OPVs) based on the small-molecule organic semiconductor p-DTS(FBTTh2)(2) is greatly improved by the addition of a conjugated block copolymer composed of difluoroquinoxaline and thienopyrrolodione blocks (D130). The power conversion efficiency (PCE) of the p-DTS(FBTTh2)(2)-based OPV is improved from 5.08% to 6.75% by the addition of 5 wt% D130 to the photoactive layer, which is composed of p-DTS(FBTTh2)(2) and a fullerene derivative. Current-voltage and grazing incidence wide-angle X-ray scattering analyses revealed that the addition of D130 significantly reduces the trap density of the device and changes the packing orientation of p-DTS(FBTTh2)(2) from mostly edge-on to partially face-on. These changes greatly improve the charge carrier mobility of the OPV, indicating that D130 is highly compatible with p-DTS(FBTTh2)(2). Furthermore, the addition of D130 improve the photostability of the OPV by reducing the burn-in loss under a light soaking intensity of 1 sun. The D130-based OPV maintained 34% of its initial PCE after a light soaking test for 858 h. In contrast, the PCE of the OPV without D130 reduced to 14% of its initial efficiency in the same time period.
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