Effect of Annealing Solvent Solubility on the Performance of Poly(3-hexylthiophene)/Methanofullerene Solar Cells
SCIE
SCOPUS
- Title
- Effect of Annealing Solvent Solubility on the Performance of Poly(3-hexylthiophene)/Methanofullerene Solar Cells
- Authors
- Park, JH; Kim, JS; Lee, JH; Lee, WH; Cho, K
- Date Issued
- 2009-10-08
- Publisher
- AMER CHEMICAL SOC
- Abstract
- The effect of the solubility of the annealing solvent on the performance of poly(3-hexylthiophene) (P3HT): C61-butyric acid methyl ester (PCBM) solar cells is studied. The short-circuit Current (J(sc)) and the fill factor (FF) increase remarkably, regardless of the type of annealing solvent, whereas a reduction of the open-circuit voltage (V-oc) (of 0.1-0.2 V) is observed after solvent annealing. Interestingly, both the value of J(sc) and the power conversion efficiency (PCE) are higher for the poor-solvent-annealed devices than for the good-solvent-annealed ones. A good solvent vapor induces better self-organization of P3HT than a poor solvent vapor. However, the exciton loss increases due to excessive phase separation. A study of the space-charge-limited current (SCLC) reveals no significant differences between the carrier mobilities of good- and poor-solvent-annealed devices. Furthermore, the measured photocurrent suggests that the space charges no longer limit the values of J(sc) and FF for all the solvent-annealed devices. These results indicate that the higher J(sc) and PCE values obtained for the poor-solvent-annealed devices can be attributed to the optimized phase separation of the active layers. which induces balanced carrier mobility and minimum exciton loss.
- Keywords
- POLYMER PHOTOVOLTAIC CELLS; MOLECULAR-WEIGHT; NANOSCALE MORPHOLOGY; OPTICAL-PROPERTIES; EFFICIENCY; FILMS; GENERATION; TRANSPORT; ACCEPTOR; NETWORK
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/26109
- DOI
- 10.1021/JP9029562
- ISSN
- 1932-7447
- Article Type
- Article
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY C, vol. 113, no. 40, page. 17579 - 17584, 2009-10-08
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