Side-chain effect on the photovoltaic performance of conjugated polymers based on benzodifuran and benzodithiophene-4,8-
- PDF / 498,114 Bytes
- 7 Pages / 432 x 648 pts Page_size
- 54 Downloads / 230 Views
MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.223
Side-chain effect on the photovoltaic performance of conjugated polymers based on benzodifuran and benzodithiophene-4,8-dione Enfang He#, Hong Zhang#, Yueyue Gao, Fengyun Guo, Shiyong Gao, Liancheng Zhao and Yong Zhang* School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
#Both authors contribute equally.
ABSTRACT:
Two benzodifuran (BDF) polymers, PBDF-C and PBDF-S, with alkyl and alkylthio substituted thiophene side-chains and benzodithiophene-4,8-dione (BDD) as the acceptor were designed and synthesized. Their optical, electrochemical properties and photovoltaic performances were systematically investigated. The polymer solar cells (PSCs) with a device structure of ITO/PEDOT:PSS/polymer:PC71BM/Ca/Al were fabricated. The PBDF-C based device showed a power conversion efficiency (PCE) of 3.01% after adding 1 vol% 1,8diodooctane (DIO) as the solvent additive, and PBDF-S gave an enhanced PCE of 3.48% without any post-treatments. The enhancements were from the higher open-circuit voltage (Voc) and fill factor (FF). The thermal- and solvent-treatment-free processing is more favourable for the large area roll-to-roll manufacturing or printing technology for PSCs.
INTRODUCTION: Solar energy has been widely recognized as the most affordable, clean and renewable energy source. The utilization of solar energy through photovoltaic technology have been investigated and commercialized, for example, the silicon-based solar panels. Among other photovoltaic technologies, polymer solar cells (PSCs) comprising conjugated polymers and fullerene derivative have showed great advantages over the silicon-based solar cells because of their low cost, lightweight, and good compatibility with the spin-coating, ink-jet printing, and screen printing for flexible large area devices, etc.[1-4] With numerous efforts in materials design and device engineering, the power
2001
Downloaded from https://www.cambridge.org/core. University of Texas Libraries, on 10 Jan 2020 at 13:15:14, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/adv.2019.223
conversion efficiencies (PCEs) of PSCs have exceeded 10%, which shows a very promising future in commercialization.[5-9] Among various types of conjugated polymers, the donor-acceptor (D-A) typed conjugated polymers have been considered as the most successful design strategy to obtain the efficient PSCs. The band-gaps, energy levels and charge carrier mobilities of D-A conjugated polymers can be easily tuned by selecting different donor and/or acceptor units. Thus, one of the key steps to get the high efficient PSCs is to design and synthesize the novel D-A conjugated polymers rationally.[10, 11] Benzo[1,2-b:4,5-b]difuran (BDF), compared to its thiophene counterpart benzo[1,2-b:4,5-b]dithiophene (BDT), has a more planar structure and lower highest occupied molecular orbital (HOMO) energy level due to the effect of siz
Data Loading...
