An alternating conjugated polymer (CPs) named as PBDT-TS-DPP, derived from 2-ethylhexylthiothiophen-2-yl-flanked (TS) benzo[1,2-b;4,5-b']dithiophene (BDT-TS) and diketopyrrolopyrrole derivatives (DPP), was prepared by Palladium-catalyzed Stille coupling reaction. The comparison investigations of the opto-electronic properties and aggregation characteristics between the PBDT-TS-DPP and PBDT-T-DPP, which was derived from 2-ethylhexylthiophen-2-yl-flanked (T) benzo[1,2-b;4,5-b']dithiophene (BDT-T) and DPP, were implemented. The results indicated that the PBDT-TS-DPP not only presented narrower optical band gap, deeper HOMO energy levels, similar charger transporting and aggregation characteristics etc., but also held enhanced relative dielectric constant (ε_r) in relative to that for the PBDT-T-DPP. To our knowledge, it is firstly to verify that the replacement of T with TS flanks would result in the enhancing ε_r besides the deepening HOMO energy levels and broadening the light response range for the BDT based CPs. Beyond that, the inverted photovoltaic cells (i-OPVs) with power conversion efficiencies (PCEs) of 5.48% and 4.78%, open circuit voltage (V_OC) of 0.78 V and 0.74 V, short current density (J_SC) of 11.52 mA/cm² and 9.46 mA/cm², fill factors (FF) of 61.0% and 68.3%, were respectively presented in PBDT-TS-DPP and PBDT-T-DPP based i-OPVs. Meanwhile, it has also been certified that the i-OPVs from PBDT-TS-DPP exhibited higher exciton dissociation probability, charge carrier density, charger carriers lifetime, and lower recombination rate co-efficiency etc., which might be attributed to the higher dielectric constant of PBDT-TS-DPP as compared with PBDT-T-DPP, thus devote to the additional improvement of the PCEs, V_OC and J_SC for the PBDT-TS-DPP based i-OPVs, except that the improvement of the these parameters were compensated from the deepening HOMO energy level and broadening light response of the PBDT-TS-DPP.

衍生自2-乙基己基噻吩-2-基（TS）苯并[1,2-b; 4,5-b']二噻吩（BDT-TS）的交替共轭聚合物（CPs），名为PBDT-TS-DPP通过钯催化的Stille偶联反应制备了二酮吡咯并吡咯衍生物（DPP）。PBDT-TS-DPP和PBDT-T-DPP（由2-乙基己基噻吩-2-基（T）苯并[1,2-b]衍生）的光电性质和聚集特性的比较研究。实施了4,5-b']二噻吩（BDT-T）和DPP。结果表明，该PBDT-TS-DPP不仅呈现窄光学带隙，更深的HOMO能级，类似于充电器输送和聚集特性等，而且还增强了保持相对介电常数（ε _ř）（相对于PBDT-T-DPP而言）。据我们所知，这是首先要验证与TS侧面更换的T将导致提高ε _[R除了深化HOMO能级和扩大对基础电信发展局的CP光响应范围。除此之外，功率转换效率（PCE）分别为5.48％和4.78％，开路电压（V _OC）为0.78 V和0.74 V，反向电流密度（J _SC）为11.52 mA的倒置光伏电池（i- OPV）/厘米²和9.46毫安/厘米²，填充因子（FF的61.0％和68.3％），在PBDT-TS-DPP和PBDT-T-DPP分别提出了基于我-OPV。同时，也已经证明，PBDT-TS-DPP的i -OPV表现出更高的激子离解概率，电荷载流子密度，电荷载流子寿命和更低的复合率系数等，这可能归因于较高的介电常数PBDT-TS-DPP与PBDT-T-DPP相比的常数，因此致力于基于PBDT-TS-DPP的i -OPV的PCE，V _OC和J _SC的额外改进，除了这些方面的改进PBDT-TS-DPP的加深HOMO能级和加宽的光响应补偿了这些参数。