This work describes the utilization of D-A-D type organic semiconductor,4,4’-(benzo[c][1,2,5]selenadiazole-4,7-diyl)bis(N,N-diphenylaniline),denoted as Se-2TPA,containing benzoselenadiazole(BSe)as acceptor core and e...This work describes the utilization of D-A-D type organic semiconductor,4,4’-(benzo[c][1,2,5]selenadiazole-4,7-diyl)bis(N,N-diphenylaniline),denoted as Se-2TPA,containing benzoselenadiazole(BSe)as acceptor core and end-capped with triphenylamine(TPA)donor units as donor materials in solar cells.Superlatively,the attachment of TPA donor moiety in BSe acceptor unit enlarged the conjugated system by extending the p-bonding which effectively tuned the optical and electrochemical properties of Se-2TPA.The bulk heterojunction organic solar cell(BHJ-OSCs)with configuration of ITO/cp-TiO_(2)/Se-2TPA:PC61BM/Au showed power conversion efficiency(PCE)of~4.12% with short circuit current(Jsc)value of~11.28 mA/cm^(2),open circuit voltage(Voc)of~0.775 V and fill factor(FF)of~0.48.PCE significantly increased from~4.12% to~5.29% when 1,8-diiodooctane(DIO)was added as an additive in Se-2TPA:PC61BM blend which associated with less phase separation and improved the charge extraction.The fabricated BHJ-OSCs processed with 3%DIO,ITO/cp-TiO_(2)/Se-2TPA:PC61BM/Au configuration displayed a long-term stability under air condition at an ambient temperature by maintaining~80% PCE for the duration of 30 days.The advantages of easy synthesis,low cost and promising cell performance supported Se-2TPA as successful organic semiconductor for BHJ-OSCs.展开更多
基金This work was also supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)No-2019R1F1063999E.-B.Kim acknowledges the research grant from NRF Korea(Project No.:2020R1A6A3A13070611).
文摘This work describes the utilization of D-A-D type organic semiconductor,4,4’-(benzo[c][1,2,5]selenadiazole-4,7-diyl)bis(N,N-diphenylaniline),denoted as Se-2TPA,containing benzoselenadiazole(BSe)as acceptor core and end-capped with triphenylamine(TPA)donor units as donor materials in solar cells.Superlatively,the attachment of TPA donor moiety in BSe acceptor unit enlarged the conjugated system by extending the p-bonding which effectively tuned the optical and electrochemical properties of Se-2TPA.The bulk heterojunction organic solar cell(BHJ-OSCs)with configuration of ITO/cp-TiO_(2)/Se-2TPA:PC61BM/Au showed power conversion efficiency(PCE)of~4.12% with short circuit current(Jsc)value of~11.28 mA/cm^(2),open circuit voltage(Voc)of~0.775 V and fill factor(FF)of~0.48.PCE significantly increased from~4.12% to~5.29% when 1,8-diiodooctane(DIO)was added as an additive in Se-2TPA:PC61BM blend which associated with less phase separation and improved the charge extraction.The fabricated BHJ-OSCs processed with 3%DIO,ITO/cp-TiO_(2)/Se-2TPA:PC61BM/Au configuration displayed a long-term stability under air condition at an ambient temperature by maintaining~80% PCE for the duration of 30 days.The advantages of easy synthesis,low cost and promising cell performance supported Se-2TPA as successful organic semiconductor for BHJ-OSCs.
