Efficient photovoltaic cells from low band-gap fluorene-based copolymer
Tian Ren-Yu (田仁玉)ab, Yang Ren-Qiang (阳仁强)a, Peng Jun-Biao (彭俊彪)ac, Cao Yong (曹镛)ac
a Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640, China; b Department of Applied Physics, South China University of Technology, Guangzhou 510640, China; c Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology (South China University of Technology), Ministry of Education, Guangzhou, 510640, China
Abstract Polymer photovoltaic cells based on low band-gap copolymer, poly[2,7-(9,9-dioctyl)fluorene-co-5,5’-(4,7-diselenophenyl)-2,2’-yl-2,1,3-benzothiadiazole] (PFSeBT), were investigated, focusing on the effects of cathode and blend concentration on device performances. The best device, with active layer from PFSeBT: PCBM=1:2 blend and with LiF/Al as cathode, shows an open-circuit voltage of 1.00 V, a short short-circuit current density of 4.42 mA/cm2, and energy conversion efficiency of 1.67% under AM1.5 illumination (100 mW/cm2). The short-circuit current density shows the dependence of power law dependence to on the incident light intensity with the power index of 0.887. All devices show spectral response until up to 680 nm. The results indicate that PFSeBT is a potential polymer functioning as electron donor in polymer photovoltaic cells.
Received: 09 July 2004
Revised: 08 November 2004
Accepted manuscript online:
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
