Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 179, Issue -, Pages 241-246Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2017.12.007
Keywords
Organic solar cells; Bulk heterojunction; Doctor blading; Vertical phase distribution
Funding
- A*STAR SERC Grant [142 520 314 1]
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The morphologies of bulk heterojunction (BHJ) films of blended semiconductor of poly(3-hexylthiophene) (P3HT) and 1-(3-methoxycarbonyl)-propyl-1-phenyl-(6,6)C61 (PCBM) deposited by doctor blading and spin coating were investigated. Controlled phase separation in BHJ organic/polymer solar cells (OSCs) were achieved using doctor blading. The results revealed that the coating method induced a significant difference in the film morphology. The vertical phase distribution of the BHJ layer fabricated by doctor blading was uniform, while uneven phase distribution was observed in spin coated BHJ layer. The uniform phase distribution in the doctor blading coated film resulted in higher charge carrier mobility and power conversion efficiency in solar cell than those in films fabricated from spin coating. The results demonstrated that doctor blading has advantages not only in large area high throughput and roll-to-roll compatibility, but also in better control of film morphology to achieve high efficiency consistently in OSC devices.
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