Four　new　metal-free　organic　dyes　QX15-18　based　on　indeno[1,2-b]indole　have　been　successfully　designed　and　synthesized.　These　D　pi　A　type　dyes　consist　of　an　indeno[1,2-b]indole　donor　and　a　benzene　or　thiophene　pi-bridge.　In　an　attempt　to　tune　their　photoelectric　properties,　the　effects　of　different　acceptor　groups　including　cyanoacrylic　acid,　rhodanine-3-acetic　acid,　and　2-(1,1dicyanomethylene)rhodanine　(DCRD)　have　been　investigated.　The　dye　QX15　with　a　cyanoacrylic　acid　acceptor　exhibited　a　highest　V-OC　of　813　mV　and　a　high　J(sc)　of　11.0　mA　cm　(-2),　generating　a　highest　power　conversion　efficiency　of　6.29%.　Meanwhile,　the　dye　QX18　with　a　DCRD　acceptor　and　a　thiophene　pi-bridge　showed　a　significantly　improved　J(sc)　of　11.9　mA　cm(-2),　which　could　be　attributed　to　its　red-shifted　absorption　spectra　and　high　molar　absorption　coefficient.　(C)　2016　Elsevier　Ltd.　All　rights　reserved.