01750nas a2200205   4500008004100000245009700041210006900138260000800207300001600215490000600231520099100237100002601228700003001254700002801284700003001312700002401342700002801366700002101394856012901415       2018                        eng d00aExperimental and theoretical investigations of different diketopyrrolopyrrole-based polymers0 aExperimental and theoretical investigations of different diketop  cSEP  a11710-117170 v33 aDiketopyrrolopyrrole (DPP)-based polymers are often considered las the most promising donor moiety in traditional bulk heterojunction solar cell devices. In this paper, we report the synthesis, characterization of various DPP-based copolymers with different molecular weights, l and polydisper sity where other aromatic repeating units (phenyl or thiophene based) are connected by alternate double bonds or triple bonds. Some of the copolymers were used for device fabrication and the crucial parameters such as fill factor (FF) and open circuit voltage (V-oc) were calculated. The density functional theory was used to optimize the geometries and deduce highest occupied molecular orbital lowest unoccupied molecular orbital gaps of all the polymers and'theoretically predict their optical and electronic properties. Optical properties of all the polymers, electrochemical properties and band gaps were also obtained experimentally and compared with the theoretically predicted values.1 aMurugan, Pachaiyappan1 aRaghavendra, Venkatraman.1 aChithiravel, Sundaresan1 aKrishnamoorthy, Kothandam1 aMandal, Asit, Baran1 aSubramanian, Venkatesan1 aSamanta, Debasis  uhttps://library.ncl.res.in/content/experimental-and-theoretical-investigations-different-diketopyrrolopyrrole-based-polymers