Spirobifluorene-cored small molecules containing four diketopyrrolopyrrole arms for solution-processed organic solar cells
Source abstract
Abstract
Spirobifluorene-linked three-dimensional small molecules of SF(DPP)4 and SF(TDPP)4 containing four diketopyrrolopyrrole arms were designed and synthesized. Both molecules displayed a broad and strong absorption in the region of 300–700 nm with suitable HOMO and LUMO energy levels as well as high charge carrier mobility. Meanwhile, solution-processed organic solar cells with a device structure of ITO/PEDOT:PSS/active layer/Ca/Al was also fabricated to investigate the photovoltaic properties of SF(DPP)4 and SF(TDPP)4. In contrast to that of star-shaped TPA(DPP)3 in solar cells, enhanced photovoltaic performance with an impressive open circuit voltage of 0.95 V and short-circuit current density of 9.12 mA/cm2 was achieved, leading to the maximum power conversion efficiency of 3.72 %. Our result here demonstrated that the three-dimensional-type small molecule in a D–A framework is a promising candidate as electron-donor materials for efficient organic solar cells.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Perovskite Materials and Applications
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