A new acceptor-donor-acceptor(A-D-A) type small-molecule acceptor NCBDT-4 Cl using chlorinated end groups is reported.This new-designed molecule demonstrates wide and efficient absorption ability in the range of 600–...A new acceptor-donor-acceptor(A-D-A) type small-molecule acceptor NCBDT-4 Cl using chlorinated end groups is reported.This new-designed molecule demonstrates wide and efficient absorption ability in the range of 600–900 nm with a narrow optical bandgap of 1.40 eV. The device based on PBDB-T-SF:NCBDT-4 Cl shows a power conversion efficiency(PCE) of 13.1%without any post-treatment, which represents the best result for all as-cast organic solar cells(OSCs) to date. After device optimizations, the PCE was further enhanced to over 14% with a high short-circuit current density(Jsc) of 22.35 m A cm-2 and a fill-factor(FF) of 74.3%. The improved performance was attributed to the more efficient photo-electron conversion process in the optimal device. To our knowledge, this outstanding efficiency of 14.1% with an energy loss as low as 0.55 eV is among the best results for all single-junction OSCs.展开更多
An acceptor-donor-acceptor （A-D-A） three-dimensional （3D） small molecule acceptor （SFTTIC）, using spiro- bifluorene as the core unit linking with four thieno[3,2-b]thiophenes （TT） and end-capped with 2-（3-oxo...An acceptor-donor-acceptor （A-D-A） three-dimensional （3D） small molecule acceptor （SFTTIC）, using spiro- bifluorene as the core unit linking with four thieno[3,2-b]thiophenes （TT） and end-capped with 2-（3-oxo-2,3-dihy- dro-lH-inden-l-ylidene）malononitrile （INCN） was developed for solution processed organic solar cells. SFTTIC has a high absorption coefficient up to 3.12 × 105 mol-1,cm-1, good thermal stability and appropriate energy levels. The optimized power conversion efficiency （PCE） of 5.66% and 4.65% was achieved for the devices with PBDB-T：SFTTIC and PTB7-Th：SFTTIC, respectively.展开更多
基金supported by the National Natural Science Foundation of China (91633301, 51773095)MoST of China (2014CB643502)+1 种基金Tianjin city (17JCJQJC44500, 17CZDJC31100)111 Project (B12015)
文摘A new acceptor-donor-acceptor(A-D-A) type small-molecule acceptor NCBDT-4 Cl using chlorinated end groups is reported.This new-designed molecule demonstrates wide and efficient absorption ability in the range of 600–900 nm with a narrow optical bandgap of 1.40 eV. The device based on PBDB-T-SF:NCBDT-4 Cl shows a power conversion efficiency(PCE) of 13.1%without any post-treatment, which represents the best result for all as-cast organic solar cells(OSCs) to date. After device optimizations, the PCE was further enhanced to over 14% with a high short-circuit current density(Jsc) of 22.35 m A cm-2 and a fill-factor(FF) of 74.3%. The improved performance was attributed to the more efficient photo-electron conversion process in the optimal device. To our knowledge, this outstanding efficiency of 14.1% with an energy loss as low as 0.55 eV is among the best results for all single-junction OSCs.
文摘An acceptor-donor-acceptor （A-D-A） three-dimensional （3D） small molecule acceptor （SFTTIC）, using spiro- bifluorene as the core unit linking with four thieno[3,2-b]thiophenes （TT） and end-capped with 2-（3-oxo-2,3-dihy- dro-lH-inden-l-ylidene）malononitrile （INCN） was developed for solution processed organic solar cells. SFTTIC has a high absorption coefficient up to 3.12 × 105 mol-1,cm-1, good thermal stability and appropriate energy levels. The optimized power conversion efficiency （PCE） of 5.66% and 4.65% was achieved for the devices with PBDB-T：SFTTIC and PTB7-Th：SFTTIC, respectively.
