OFET-type optical memories using light bias as the fourth terminal enable low voltage electrical stresses to suffice in generating substantial memory window and photoassisted multibit storage.The undefined molecular s...OFET-type optical memories using light bias as the fourth terminal enable low voltage electrical stresses to suffice in generating substantial memory window and photoassisted multibit storage.The undefined molecular structure and trapping mechanism of most storage media limit their practical applications.Herein,we report a series of charge trapping materials with the rigid and planar conjugated structure of benzo[1,2-b:4,5-b’]dithiophene(BDT)acting as the charge trapping site and photoresponsive group,while the insulated(triisopropylsilyl)acetylene(TIPS)unit is introduced to prevent the leakage path of the charge.The pentacene-based OFET memory with solution-processing TTIPS-BDT shows fast trapping speed,tunable ambipolar memory,large memory window and reliable charge retention,which is obviously improved compare to the performance of BDT and DTIPS-BDT devices.In addition,the charge trapping,memory characteristics and photoresponsive behaviors are also discussed in detail.The TTIPS-BDT device shows a specific response to green light illumination.This study suggests that BDT derivatives serving as charge trapping elements possess potential applications in future photoresponsive memory and plastic electronics.展开更多
Three conjugated polymers based on thienyl-substituted benzodithiophene(BDT) and 4,7-bis-thienyl-benzothiadiazole(DTBT) with varied substitution positions of the alkyl side chains were synthesized to investigate the c...Three conjugated polymers based on thienyl-substituted benzodithiophene(BDT) and 4,7-bis-thienyl-benzothiadiazole(DTBT) with varied substitution positions of the alkyl side chains were synthesized to investigate the correlations between the structure and photovoltaic performance of the polymer photovoltaic materials.The three polymers named PBDTDTBT-p,PBDTDTBT-o and PBDTDTBT-m were characterized by a set of methods including absorption spectroscopy,cyclic voltammetry,thermogravimetric analysis,X-ray diffraction,density functional theory and photovoltaic measurements.The results show that the steric hindrance caused by the different substitution positions of the alky chains has a significant influence on the photovoltaic properties of the polymers.The open-circuit voltage(Voc) of the photovoltaic devices based on the three polymers could range from 0.67 to 0.90 V.Clearly,this finding provides us a feasible strategy to optimize the photovoltaic properties by simply changing the positions of the alkyl chains.展开更多
基金supported by the National Natural Science Foundation of China(62288102,51933005,61604081)the National Key R&D Program of China(2024YFB3612600)+1 种基金the Basic Research Program of Jiangsu(BK20240033)the Natural Science Foundation Project of Jilin Province(20230101294JC).
文摘OFET-type optical memories using light bias as the fourth terminal enable low voltage electrical stresses to suffice in generating substantial memory window and photoassisted multibit storage.The undefined molecular structure and trapping mechanism of most storage media limit their practical applications.Herein,we report a series of charge trapping materials with the rigid and planar conjugated structure of benzo[1,2-b:4,5-b’]dithiophene(BDT)acting as the charge trapping site and photoresponsive group,while the insulated(triisopropylsilyl)acetylene(TIPS)unit is introduced to prevent the leakage path of the charge.The pentacene-based OFET memory with solution-processing TTIPS-BDT shows fast trapping speed,tunable ambipolar memory,large memory window and reliable charge retention,which is obviously improved compare to the performance of BDT and DTIPS-BDT devices.In addition,the charge trapping,memory characteristics and photoresponsive behaviors are also discussed in detail.The TTIPS-BDT device shows a specific response to green light illumination.This study suggests that BDT derivatives serving as charge trapping elements possess potential applications in future photoresponsive memory and plastic electronics.
基金supported by the National Basic Research Program(2014CB643500)the National Natural Science Foundation of China(91333204 and 51261160496)the Chinese Academy of Sciences(XDB12030200 and KJZDEW-J01)
文摘Three conjugated polymers based on thienyl-substituted benzodithiophene(BDT) and 4,7-bis-thienyl-benzothiadiazole(DTBT) with varied substitution positions of the alkyl side chains were synthesized to investigate the correlations between the structure and photovoltaic performance of the polymer photovoltaic materials.The three polymers named PBDTDTBT-p,PBDTDTBT-o and PBDTDTBT-m were characterized by a set of methods including absorption spectroscopy,cyclic voltammetry,thermogravimetric analysis,X-ray diffraction,density functional theory and photovoltaic measurements.The results show that the steric hindrance caused by the different substitution positions of the alky chains has a significant influence on the photovoltaic properties of the polymers.The open-circuit voltage(Voc) of the photovoltaic devices based on the three polymers could range from 0.67 to 0.90 V.Clearly,this finding provides us a feasible strategy to optimize the photovoltaic properties by simply changing the positions of the alkyl chains.
