New m-alkoxy-p-fluorophenyl difluoroquinoxaline based polymers in efficient fullerene solar cells with high fill factor
摘要:
Two new donor (D) -acceptor (A) copolymers, named m-O-p-F-DFQx-BDT (OFQx-T) and m-EH-p-FDFQx-BDT (EHFQx-T), which were based on meta-octyloxy-para-fluorophenyl and meta-ethylhexyloxypara-fluorophenyl difluoroquinoxaline as acceptor units (O-DFQx/EH-DFQx) and alkylthienyl substituted benzodithiophene (BDT) as a donor unit, were designed and synthesized. EHFQx-T had higher absorption coefficient than OFQx-T which contributed to larger short-circuit current density (J(sc)). EHFQx-T showed a lower the highest occupied molecular orbital (HOMO) which is beneficial for the voltage open-circuit (V-oc). The polymer solar cells (PSCs) based OFQx-T: PC71BM and EHFQx-T: PC71BM blended film as active layer showed high power conversion efficiency (PCE) of 7.60% and 8.44%, respectively, with 1,8diiodooctane (DIO) solvent additive treatment. More importantly, OFQx-T: PC71BM and EHFQxT: PC71BM had good fill factor (FF), especially the FF of OFQx-T: PC71BM was over 70%. The high FF contributed to obtain high PCEs for OFQx-T and EHFQx-T. The more balanced and higher charge mobility, smaller geminate recombination and suitable nanoscale phase separation size of EHFQx-T demonstrate that changing octyl chain to ethylhexyl chain in DFQx acceptor unit is efficient to improve photovoltaic properties in fullerene solar cells. (C) 2017 Elsevier B. V. All rights reserved.
each of two ends is joined to an electron-donating benzodithiophene (BDT) derivative (DI). The SMD1, SMD2 and SMD3 are substituted with 0, 2 and 4 fluorine atoms on their BT moiety respectively. The assistance of DFT methods is taken to evaluate the influence of fluorine on reorganization energies, ionizing potential and electron affinity of molecules. The thermal stability of molecules is mapped by TGA
Two small molecule donors, ICT4 and ICT6, with different extent of fluorine atoms are synthesized and their photovoltaic properties are explored.
两种小分子给体,ICT4 和 ICT6,具有不同数量的氟原子,被合成并研究了它们的光伏特性。
[EN] WEAK ELECTRON-DONATING BUILDING BLOCKS, COPOLYMERS THEREOF AND RELATED DEVICES<br/>[FR] BLOCS STRUCTURAUX FAIBLES DONNEURS D'ÉLECTRONS, COPOLYMÈRES CORRESPONDANTS ET DISPOSITIFS ASSOCIÉS
申请人:UNIV SOUTH SCIENCE & TECHNOLOGY CHINA
公开号:WO2018119780A1
公开(公告)日:2018-07-05
A compound having a formula (I) is provided, in which each of A and B is independently and respectively one of formula (II) and (III), given that at least one of A and B comprise an alkynyl, each of R1 and R2 is independently and respectively a C1-20 alkyl, a thienyl or a phenyl, and each of the thienyl and the phenyl is optionally and independently substituted with a C1-20 alkyl. An organic semiconductor polymer formed by an electron donor unit and an electron acceptor unit, a film formed by the organic semiconductor polymer, and a semiconductor device are also provided.
[EN] AN ELECTRON-DONATING UNIT, A COPOLYMER THEREOF AND THEIR PREPARATION METHODS, AS WELL AS THEIR USES<br/>[FR] MOTIF DONNEUR D'ÉLECTRONS, SON COPOLYMÈRE ET LEURS PROCÉDÉS DE PRÉPARATION, AINSI QUE LEURS UTILISATIONS
申请人:UNIV SOUTH SCIENCE & TECHNOLOGY CHINA
公开号:WO2017152354A1
公开(公告)日:2017-09-14
An electron-donating unit of the Formula, a copolymer thereof and their preparation methods, as well as their uses in thin-film transistor or polymer solar cell. The electron-donating unit is an effective building block for constructing high-performance polymer semiconductors due to its solubilizing ability, centrosymmetric geometry, backbone planarity, compact packing, and appropriate electron donating ability versus the previously reported BTOR and DTP units.
A reactive compound represented by the following formula (I):
[In the formula (I), Z represents a divalent group. A plurality of Y may be the same or different, and represent a monovalent boronate residue having at least one hydroxyl group, Ar
1
and Ar
2
may be the same or different, and represent a trivalent aromatic hydrocarbon group or a trivalent heterocyclic group.].