Intramolecular Donor–Acceptor Regioregular Poly(hexylphenanthrenyl‐imidazole thiophene) Exhibits Enhanced Hole Mobility for Heterojunction Solar Cell Applications

Abstract

PHPIT, a new kind of intramolecular donor–acceptor side‐chain‐tethered hexylphenanthrenyl‐imidazole polythiophene is synthesized. The more‐balanced electron and hole mobilities and the enhanced visible‐ and internal‐light absorptions in the devices consisting of annealed PHPIT/PCBM blends both contribute to a much higher short‐circuit current density, which in turn led to a power conversion efficiency as high as 4.1%.

Progress in Organic Photovoltaic Fibers Research

“…Organic solar cells have many advantages such as potential to be semi-transparent, manufacture on both large or small areas compatible with mass production and low-cost, production possibility with continuous coating and printing processes on lightweight and flexible substrates (for example textiles), ecological and low-temperature production possibilities (Dennler et al, 2006a;Dennler & Sariciftci, 2005). Polymer heterojunction organic solar cells have attracted much attention because of their potential applications in large area, flexible and low-cost devices (Park et al, 2009;Chang et al, 2009;Dridi et al, 2008;Peet et al, 2009;Oey et al, 2006;Yu et al, 2008). Polymer based thin films on flexible and non-flexible substrates can be achieved by various printing techniques (see Fig.…”

Difluorobenzothiadiazole based two-dimensional conjugated polymers with triphenylamine substituted moieties as pendants for bulk heterojunction solar cells

“…The bipolar characteristics of D/A-type conjugated polymers, containing both electron-and hole-transporting moieties, can result in lower-energy band gaps and higher charge mobilities for the photoactive layers, thereby enhancing the PV efficiencies of PSCs [11][12][13][14][15]. Polythiophene (PT) derivatives bearing electron-donating and -withdrawing pendant groups, so-called two-dimensional (2-D) low band gap conjugated polymers, have been proposed by several groups for PSC applications [16][17][18][19][20][21][22][23][24][25]. The introduction of conjugated moieties as pendant units that absorb broadly in the UV and visible regions can, therefore, lead to the greater harvesting of solar light.…”

The effect of intramolecular donor–acceptor moieties with donor–π-bridge–acceptor structure on the solar photovoltaic performance

“…Recently, a series of intramolecular donor-acceptor conjugated copolymers of -(A) m -(B) n -random type have been synthesized by Wei's group and used as the donor materials in the active layers of PSCs [4,5,9]. For this kind of conjugated polymers, thiophene derivatives were used as the electron donating groups and presented in the main chain, and phenanthrenylimidazole (PI) moieties with the characteristic of coplanar were employed as the side-chain-tethered electron accepting units.…”