A material comprising an electron-accepting unit of formula (I), wherein Ar1 is a 5- or 6-membered aromatic or heteroaromatic ring or is absent; Ar2 is a 5- or 6-membered aromatic or heteroaromatic ring or is absent; and wherein the electron-accepting unit of formula (I) is substituted with at least one electron-withdrawing group. The material further comprises an electron-donating unit D comprising a fused or unfused furan or thiophene. The material may be a polymer comprising repeat units of formula (I). The material may be a non-polymeric compound. An organic photodetector may contain a bulk heterojunction layer containing an electron acceptor or an electron donor wherein at least one of the electron acceptor and electron donor contains unit of formula (I).
一种材料,包含式(I)的电子受体单元,其中Ar1是一个5-或6-成员芳香或杂芳环或不存在;Ar2是一个5-或6-成员芳香或杂芳环或不存在;式(I)的电子受体单元被至少一个电子提取基团取代。该材料进一步包括一个电子给体单元D,包括融合或未融合的
呋喃或
噻吩。该材料可以是包含式(I)重复单元的聚合物。该材料可以是非聚合物化合物。有机光电探测器可以包含一个体异质结层,其中包含一个电子受体或电子给体,其中至少一个电子受体和电子给体包含式(I)的单元。