Date

Place

Room D (Room 322)
37. Organic Photovoltaics
August 20, 2015 (Thursday)
15:30 ~ 17:05

[37-1]
15:30 ~ 15:55
Title:[Invited] Molecular Design and Property Relationship for Ideal Polymeric Solar Cells
Han Young?Woo (Pusan Nat'l Univ., Korea)
Abstract: A series of semi-crystalline, low band gap (LBG) polymers were designed, synthesized and characterized for polymer solar cells (PSCs). The polymers were designed by considering intra- and/or intermolecular noncovalent hydrogen bonds and dipole-dipole interactions for strong interchain interactions without losing solution processability. The semi-crystalline polymers form a well-distributed nano-fibrillar networked morphology with PC70BM with balanced hole and electron mobilities and tight interchain packing (��-�� stacking distance of 3.57-3.59 A) in the blend films. Furthermore, the device optimization with a processing additive and methanol treatment improves efficiencies up to 9.39% in a ~300 nm thick conventional single-cell device structure. PPDT2FBT closely tracks theoretical photocurrent production while maintaining a high fill factor in remarkably thick films. The unique behavior arises from high vertical carrier mobility, an isotropic morphology with strong, vertical ��-�� stacking and a suitable energy band structure. The ability of PPDT2FBT to function efficiently in thick cells allows devices to fully absorb the incident sunlight while providing a pathway to defect-free, large area film processing by industrial solution casting techniques, leading to commercially viable PSCs. These new polymers provide a great possibility to overcome the efficiency barrier of 10% and accelerate the real application of plastic solar cells.
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