Split-second Annealing of Poly(3-hexylthiophene):Fullerene Derivative Thin-Films via Intense Pulsed White Light for Efficient Polymer Solar Cells
- Split-second Annealing of Poly(3-hexylthiophene):Fullerene Derivative Thin-Films via Intense Pulsed White Light for Efficient Polymer Solar Cells
- 양희연; 홍재민; 김태환; 송용원; 최원국; 임정아
- polymer solar cells; Intensely pulsed white light; annealing process; Bulk-heterojunction
- Issue Date
- The 13th Pacific Polymer Conference
- Polymer solar cells have emerged as excellent candidates for potential applications in flexible optoelectronic devices due to their low cost, flexibility and light-weight. Bulk-heterojunctions (BHJ) architecture of photoactive layer which consists of a blend of a polymeric electron donor (D) and a fullerene electron acceptor (A) leads a significant breakthrough toward enhancing the power conversion efficiencies of polymer solar cells. Especially, it is well known that annealing process of BHJ photoactive layer is a key step to control D-A phase separation morphology and improve the light absorption properties and the charge carrier mobility by inducing the self-organization of polymeric electron donor. Up to date, various annealing process such as thermal treatment1, solvent vapor exposure2, microwave treatment3, have been successfully demonstrated. However, such annealing methods are time-consuming and inefficient process, which is not potentially appropriate for high-speed roll-to-roll production of polymer solar cells in the future. Here, we introduced a facile method to control the morphology of P3HT:PCBM thin films within a few seconds using pulsed white light. Pulsed white light irradiation on P3HT:PCBM thin films for only 2 seconds resulted in improved PCEs of the device almost approaching to that of the devices prepared by typical thermal treatment. After the irradiation of pulsed white light, the crystallinity and light absorption properties of the P3HT:PCBM photoactive layer is improved which are mainly reasons of the enhancement in power conversion efficiency. This demonstration can provide the excellent way to rapid mass-production of highly efficient polymer solar cells.
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