Diffusion and influence on photovoltaic characteristics of p-type dopants in organic photovoltaics for energy harvesting from blue-light

• Published in: Organic electronics Vol. 52; pp. 17 - 21
• Main Authors: Jung, Min-Cherl, Kojima, Hirotaka, Matsumura, Izumi, Benten, Hiroaki, Nakamura, Masakazu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2018
• Subjects: Blue-light absorbing solar cell; BPh-BTBT; P-type doping; Secondary ion mass spectroscopy; P-type doping; Secondary ion mass spectroscopy; BPh-BTBT; Blue-light absorbing solar cell
• ISSN: 1566-1199; 1878-5530
• DOI: 10.1016/j.orgel.2017.10.006

To improve the performance of organic photovoltaics (OPV) for energy harvesting from blue-light, the OPVs (Ag/BCP/C60/BPh-BTBT/10 mol% p-doped BPh-BTBT/ITO) are fabricated with several dopants such as F4TCNQ, C60F36, HATCN, and Mo(tfd)3. The power conversion efficiencies of the OPVs with F4TCNQ, C60F36, HATCN, and Mo(tfd)3-doped BPh-BTBT obtained by white light-emitting diode source are improved with 60, 78, 46, and 49% than those by normal solar light, respectively. Secondary ion mass spectroscopy is performed with the 1-day and 7-days samples after the sample fabrication to observe the dopant distributions in each p-doped layer. Diffusion of dopant is observed only in the F4TCNQ-doped BPh-BTBT. [Display omitted] •Blue-light-absorbing organic photovoltaic devices are studied for energy harvesting from indoor ambient light.•P-type doping is employed to overcome the large injection/extraction barrier between an anode and a wide-band-gap organic semiconductor.•C60F36- and F4TCNQ-doping to the anode side effectively improved the device performance.•Diffusion in the semiconductor layer after the completion of device is observed for F4TCNQ by seven-days storage.