Effects of PBr<sub>3</sub>Addition to Polysilane Thin Films on Structures and Photovoltaic Properties

• 作者: Atsushi Suzuki Junya Nakagawa Kazufumi Kohno Masahiro Yamada Sakiko Fukunishi Takeo Oku Tsuyoshi Akiyama
• 来源期刊: 绿色与可持续化学(英文)
• 学科: 化学
• 关键词: Microstructure THIN Film Property POLYSILANE Solar Cell
• 年，卷（期）: 2017,（1）
• 页码范围: 20-34
• 页数: 15页
• 分类号: O6

摘要

Organic thin film solar cells are potential next generation solar cells. Many p-type semiconductors have been used in organic solar cells, but there have been far fewer reports involving n-type organic semiconductors. Developing new n-type organic semiconductors is therefore desirable. Polysilane thin films were spin-coated from solutions containing phosphorus (P), and the effects of P addition on film microstructures and electronic properties as n-type semiconductors were investigated. Microstructures of poly-methyl-phenyl-silane (PMPS), dimethyl-polysilane (DMPS) and deca-phenyl-penta-silane (DPPS) thin films were investigated by X-ray diffraction and transmission electron microscopy. PMPS thin films doped with P (PMPS(P)) were amorphous upon annealing at 300&#176C, while DMPS(P) and DPPS(P) thin films exhibited crystalline structures. PMPS(P) and DMPS(P) thin films exhibited decreased electrical resistances upon P doping. The energy gaps of PMPS(P), DMPS(P) and DPPS(P) were 3.5, 3.9 and 3.8 eV, respectively. Decreased photoluminescence intensities of PMPS, DMPS and DPPS were observed upon P doping. The desorption of phenyl and methyl groups from PMPS(P) thin films was observed from Raman scattering measurements. Solar cells containing polysilane(P)/poly[3-hexylthiophene] heterojunction structures were fabricated and exhibited photovoltaic behavior.