Four　metal-free　organic　dyes　QX05-08　based　on　indoloquinoxaline　and　phenothiazine　have　been　successfully　designed　and　synthesized　for　dye-sensitized　solar　cells.　The　D-D-pi-A　type　dyes　QX07　and　QX08　consist　of　an　indoloquinoxaline　donor,　a　phenothiazine　donor,　a　cyanoacrylic　acid　acceptor/anchoring　group　and　a　thiophene　or　furan　pi-bridge.　Other　simple　D-pi-A　type　dyes　QX05　and　QX06　based　on　indoloquinoxaline　and　phenothiazine　respectively　have　also　been　synthesized　for　comparison.　The　D-D-pi-A　type　dyes　QX07　and　QX08　present　good　balanced　structures　and　show　excellent　photoelectric　properties.　Especially,　the　dye　QX07　with　a　thiophene　unit　as　the　pi-bridge　exhibits　the　best　photovoltaic　performances　in　solar　cells.　A　high　power　conversion　efficiency　up　to　8.28%　with　a　J(sc)　of　15.3　mA　cm(-2)　and　a　V-oc　of　757　mV　have　been　achieved　by　the　dye　0)107　using　an　iodine　electrolyte　under　standard　conditions.　(C)　2016　Elsevier　B.V.　All　rights　reserved.