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Title: Experimental study of end-capped acceptors influencing the photo-physical, electrochemical and thermal parameters of A-D-π-D-A type small molecular electron donors
Authors: Appalanaidu, Ejjurothu
Busireddy, Manohar Reddy
Reddy, B V Subba
Rao, Vaidya Jayathirtha
Keywords: Dithienopyrrole-fluorene;A-D-π-D-A type structure;End-capped acceptors;Organic solar cell material
Issue Date: Mar-2020
Publisher: NISCAIR-CSIR, India
Abstract: We have designed A-D-π-D-A type three new small molecular donor materials denoted as FD-IND, FD-DCV and FD-NBR, which have been synthesised and their photo-physical, electrochemical and thermal properties explored. The synthesised materials have fluorene as “π-spacer,” dithieonopyrrole as “Donor” (D) and various “Acceptor” (A) units are 1,3-indanedione (IND), dicyanovinylene (DCV) and N-butyl rhodanine (NBR). All these three materials have good solubility (~30 mg/mL) in most common organic solvents and have relatively broad absorption in the visible region covering the range of 300-650 nm with two primary absorption bands. The absorption bands located at shorter wavelength region are ascribed to a localized aromatic π-π* transition of the A-D-π-D-A system, while the bands at longer wavelength are mainly attributed to an ICT transition. All the compounds exhibit excellent thermal stabilities in the range of 260-373°C. Cyclic voltammetry data provided HOMO values as −5.26, −5.32 and −5.32 eV for FD-NBR, FD-DCV and FD-IND respectively. LUMO values estimated from HOMO values and optical band gap are −3.27, −3.22 and −3.37 eV for FD-NBR, FD-DCV and FD-IND respectively. Therefore, these are potential molecules for organic solar cells.
Page(s): 385-392
ISSN: 0975-0983(Online); 0376-4699(Print)
Appears in Collections:IJC-B Vol.59B(03) [March 2020]

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