Three novel (D−π−A)₃−type metal-free organic dyes (PTZTC1−3) along with a reference dye (RD−SC) bearing a mono D−π−A unit, comprising 4-positon substituted phenyl coupled with phenothiazine as a donor, thiophene as a π-conjugated linker and cyanoacrylic acid as an acceptor, were synthesized. The UV–Vis absorption spectra in solution and on TiO₂ film, electrochemical redox potentials, and the photovoltaic parameters including incident monochromatic photon-to-current conversion efficiency (IPCE), short-circuit current (J_sc), open-circuit voltage (V_oc), maximum power conversion efficiency (η), and electrochemical impedance spectroscopy (EIS) of the corresponding dye-sensitized solar cells (DSSCs) were further explored. Among the DSSCs fabricated with these dyes, the PTZTC3 sensitized cell showed a η of 6.09% under standard global AM 1.5 solar condition (100 mW cm⁻²) owing to its relatively higher IPCE, higher J_sc, higher V_oc and longer electron lifetime (τ_r).

三种新型（d-π-A）₃型无金属有机染料（PTZTC1 - 3）（与参考染料沿着RD - SC）带有单d-π-A单元，包括4-取代的当前位置苯基加上合成了吩噻嗪作为供体，噻吩作为π-共轭连接体和氰基丙烯酸作为受体。溶液和TiO ₂薄膜上的UV-Vis吸收光谱，电化学氧化还原电势以及光伏参数，包括入射单色光子-电流转换效率（IPCE），短路电流（J _sc），开路电压（V _oc），最大功率转换效率（η），并进一步探索了相应的染料敏化太阳能电池（DSSC）的电化学阻抗谱（EIS）。在用这些染料制成的DSSC中，由于其相对较高的IPCE，较高的J _sc，较高的V _oc和更长的电子寿命，PTZTC3敏化电池在标准的全球AM 1.5太阳光条件下（100 mW cm ^-2）显示的η为6.09％。（τ _{- [R} ）。