Benzodithiophene and Benzotriazole Bearing Conjugated Polymers for Electrochromic and Organic Solar Cell Applications

Abstract

Herein, alternating donor-acceptor type benzodithiophene and benzotriazole bearing copolymers were synthesized and thieno [3,2-b]thiophene and furan units were incorporated as π-bridges. The application of these polymers for electrochromic and photovoltaic studies were performed. Spectroelectrochemical studies illustrate that both polymers showed multichromic behavior due to tailoring of polaron bands in visible region. Photovoltaic properties of P2 were performed by conventional device structure. The best performance device based on P2: PC 71 BM (1:3, w/w) exhibited the power conversion efficiency of 2.98%, with V oc of 0.74 V, J sc of 6.31 mA/cm 2 , and FF of 64%. The carrier mobility of the P2: PC 71 BM was calculated as 1.37 × 10 −3 cm 2 /V.s via space-charge-limited current method.

Structure–Property Study of Homoleptic Zinc(II) Complexes of Di(arylethynyl) Azadipyrromethene as Nonfullerene Acceptors for Organic Photovoltaics: Effect of the Aryl Group

“…Hole mobility (μ h ) measurement was done using a device structure of ITO/PEDOT:PSS/active layer/MoO 3 /Ag, and electron mobility (μ e ) measurement was done using a device structure of ITO/ZnO/active layer/Ca/Al. The charge mobility was calculated with the Mott–Gurney law under the trap-free SCLC situation using the equation where J is the current, ε 0 is the permittivity of free space, ε r is the relative permittivity of the material, μ is the charge carrier mobility, V is the effective voltage, and L is the thickness of the active layer . The SCLC graphs are shown in Figure S15, and the results are summarized in Table .…”

Recent Advances of Furan and Its Derivatives Based Semiconductor Materials for Organic Photovoltaics

“…Naime et al chose benzotriazole to replace benzothiadiazole unit as acceptor unit, synthesizing a new copolymer PF30 . [ 133 ] Due to relatively weak electron‐withdrawing ability of acceptor unit, PF30 showed a wider bandgap compared to PF29 . But as the absorption of wide bandgap of PF30 is not complement with acceptor, the device based on PF30 :PC 71 BM (1:3, w/w) exhibited relatively low photovoltaic performance.…”

Synthesis of a Multifunctional Quinoxaline and Benzodithiophene Bearing Polymer and Its Electrochromic Device Applications

“…In the literature, different donor and acceptor combinations were performed to enhance optoelectronic properties; benzotriazole (BTz), benzimidazole (BIm), and quinoxaline (Qx) units are widely preferred as the acceptor units due to their promising electron‐accepting abilities and easy functionalization. [ 15,16 ] Among them, with their strongly electronegative imine groups, relatively stable quinoid form, and high solubility, the Qx comprising organic conjugated polymers continue to fascinate many scientists due to their desirable properties like strong electron‐withdrawing ability, ease of preparation, and modification which make possible to control the morphology and optoelectronic properties. It is noteworthy to mention that, easy substitution sides of Qx unit resulted multifunctional conjugated polymers with low band gap, red shifted absorption, solubility, and low HOMO energy levels.…”