Because poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)(PEDOT:PSS)is water processable,thermally stable,and highly conductive,PEDOT:PSS and its composites have been considered to be one of the most promising f...Because poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)(PEDOT:PSS)is water processable,thermally stable,and highly conductive,PEDOT:PSS and its composites have been considered to be one of the most promising flexible thermoelectric materials.However,the PEDOT:PSS film prepared from its commercial aqueous dispersion usually has very low conductivity,thus cannot be directly utilized for TE applications.Here,a simple environmental friendly strategy via femtosecond laser irradiation without any chemical dopants and treatments was demonstrated.Under optimal conditions,the electrical conductivity of the treated film is increased to 803.1 S cm^(-1)from 1.2 S cm^(-1)around three order of magnitude higher,and the power factor is improved to 19.0μW m^(-1)K^(-2),which is enhanced more than 200 times.The mechanism for such remarkable enhancement was attributed to the transition of the PEDOT chains from a coil to a linear or expanded coil conformation,reduction of the interplanar stacking distance,and the removal of insulating PSS with increasing the oxidation level of PEDOT,facilitating the charge transportation.This work presents an effective route for fabricating high-performance flexible conductive polymer films and wearable thermoelectric devices.展开更多
PEDOT:PSS buffer layers have been processed with the standard annealing step used for organic solar cells device applications. The d.c. conductivity σ as a function of temperature for two heating rates under He and a...PEDOT:PSS buffer layers have been processed with the standard annealing step used for organic solar cells device applications. The d.c. conductivity σ as a function of temperature for two heating rates under He and atmospheric air was studied. Moreover, the stability of the conductivity was investigated at different temperatures and environments vs time. The main results can be summarized in the following: the increase of σ due to the thermal activation of the carriers and the improvement of the crystallinity compete with the decrease of σ resulting from the irreversible structural degradation of the polymer chains promoted by the oxygen and moisture of the atmospheric air. The heat treatment time and the temperature at which the two competing mechanisms result in a maximum of the electrical conductivity have been determined and results are discussed relevant to organic optoelectronic devices containing PEDOT: PSS buffer layers.展开更多
Thermoelectric(TE)energy harvesting can effectively convert waste heat into electricity,which is a crucial technology to solve energy concerns.As a promising candidate for energy conversion,poly(3,4-ethylenedioxythiop...Thermoelectric(TE)energy harvesting can effectively convert waste heat into electricity,which is a crucial technology to solve energy concerns.As a promising candidate for energy conversion,poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)has gained significant attention owing to its easy doping,high transparency,and solution processability.However,the TE performance of PEDOT:PSS still needs to be further enhanced.Herein,different approaches have been applied for tuning the TE properties:(i)direct dipping PEDOT:PSS thin films in ionic liquid;(ii)post-treatment of the films with concentrated sulfuric acid(H_(2)SO_(4)),and then dipping in ionic liquid.Besides,the same bis(trifluoromethanesulfonyl)amide(TFSI)anion and different cation salts,including 1-ethyl-3-methylimidazolium(EMIM+)and lithium(Li+),are selected to study the influence of varying cation types on the TE properties of PEDOT:PSS.The Seebeck coefficient and electrical conductivity of the PEDOT:PSS film treated with H2SO4EMIM:TFSI increase simultaneously,and the resulting maximum power factor is 46.7μW·m^(-1)·K^(-2),which may be attributed to the ionic liquid facilitating the rearrangement of the molecular chain of PEDOT.The work provides a reference for the development of organic films with high TE properties.展开更多
改进了聚(3,4-乙烯基二氧噻吩)/聚(苯乙烯磺酸盐)(PEDOT:PSS)的合成技术。采用对甲苯磺酸铁[(Fe(OTs)_(3))]作为催化剂,并在反应中引入磷酸三乙酯作为水溶性助剂并辅助催化反应且消泡稳黏,以优化PEDOT:PSS的成膜性能。同时,利用微通道...改进了聚(3,4-乙烯基二氧噻吩)/聚(苯乙烯磺酸盐)(PEDOT:PSS)的合成技术。采用对甲苯磺酸铁[(Fe(OTs)_(3))]作为催化剂,并在反应中引入磷酸三乙酯作为水溶性助剂并辅助催化反应且消泡稳黏,以优化PEDOT:PSS的成膜性能。同时,利用微通道搅拌方法制备了均匀粒径(<50 nm)的OE-004 PEDOT:PSS分散液,然后将OE-004应用于器件表征以全面评估OE-004与Clevios P VP AI 4083的性能差异并验证其适用性。研究结果表明,OE-004材料因更均匀的粒径尺寸和优化的微观配比,在PM6:L8-BO器件中表现出与Clevios P VP AI 4083基本一致的优秀空穴传输性能,实现了17.72%的最佳光电转换效率。器件复合过程研究表明OE-004呈现出良好的空穴提取和传输能力,在抑制器件内部的单分子复合或陷阱辅助复合方面表现出色。这些结果清晰验证了OE-004在有机太阳能电池中的适用性,其优异性能为空穴用PEDOT:PSS提供了理想的国产产品。展开更多
聚(3,4-乙撑二氧噻吩):聚苯乙烯磺酸盐(PEDOT:PSS)具有良好的导电性和柔性,在可穿戴的柔性电致变色器件和柔性太阳能电池中显示出巨大的潜力。通过不同的化学沉积和物理掺杂可以更大的提高PEDOT:PSS的电化学性能。目前PEDOT:PSS在有机...聚(3,4-乙撑二氧噻吩):聚苯乙烯磺酸盐(PEDOT:PSS)具有良好的导电性和柔性,在可穿戴的柔性电致变色器件和柔性太阳能电池中显示出巨大的潜力。通过不同的化学沉积和物理掺杂可以更大的提高PEDOT:PSS的电化学性能。目前PEDOT:PSS在有机太阳能电池(Organic solar cells, OSCs)空穴传输层(HTL)的应用研究极为广泛,但是其具有低电导率、水/氧敏感、腐蚀电极等缺陷。为了追求优异的性能,常用的PEDOT:PSS空穴传输层仍需优化。本文综述了近年来PEDOT:PSS的各种改善方法和在有机太阳能电池空穴传输层中的应用研究最新进展,并介绍了PEDOT:PSS在柔性有机太阳能电池的应用。展开更多
The conductivity difference Δσ between two similar PEDOT:PSS films, 120 nm thick, heated by 5 and 15 K/min from 80 to 440 K, the one under inert He and the other under ambient air gives an approximate measure of the...The conductivity difference Δσ between two similar PEDOT:PSS films, 120 nm thick, heated by 5 and 15 K/min from 80 to 440 K, the one under inert He and the other under ambient air gives an approximate measure of the influence of oxygen and moisture on the conductivity vs temperature T. The resulting curves Δσ = f(T) exhibit three different regions: at temperatures from 80 to 145 K for heating rate 5 K/min and from 80 to 200 K for 15 K/min, an intense degradation of the sample under ambient atmosphere was revealed by the abrupt increase of the difference of the conductivities between He and atmospheric air. At intermediate temperatures from 145 to 380 K for 5 K/min and 200 to 400 K for 15 K/min, the conductivity difference remains basically constant indicating a stabilization of the damage produced by oxygen and moisture. Finally, for temperatures higher than 380 to 400 K the degradation increases again. An explanation of this behavior is proposed based on the hydrophilic character of the PSS and the destructive role of oxygen at high temperatures. Moreover, the isotherms σ = σ(t), where t is the heating time, at 443 K, under inert He and under atmospheric air for one hour verify the significant role of oxygen and moisture on the electrical conductivity. Under He the conductivity increases monotonically with t, but under ambient air factors the conductivity competes with others decreasing it producing a maximum at about t = 10 min.展开更多
Mixed Stearic acid and poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS) Langmuir- Blodgett(LB) films were successfully fabricated by the conventional vertical dipping method.Stearic acid and PEDOT...Mixed Stearic acid and poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS) Langmuir- Blodgett(LB) films were successfully fabricated by the conventional vertical dipping method.Stearic acid and PEDOT/PSS was dissolved in chloroform and spread on subphase containing 0.04wt% FeCl_3.Conductive Y-type mixed LB films was successfully prepared under the condition of surface pressure with 30 mN/m,pH 3.8,and 19℃.UV-VIS spectrum showed that well ordered layer-by-layer fabrication of mixed films were obtained and thickness of single layer film with about 5 nm was evaluated.The morphology image of mixed LB film was observed by atomic force microscopy (AFM).The conductivity of mixed LB film was about 1.8×10^(-5)S/cm and the film showed sensitivity to NH_3 at the same time.展开更多
基金supported by the National Key Research and Development Program of China(2020YFA0715000)the Guangdong Basic and Applied Basic Research Foundation(2020A1515110250,2021B1515120041)+1 种基金the Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory(XHT2020-005)the Fundamental Research Funds for the Central Universities(2020IVA068,2021lll007JC)
文摘Because poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)(PEDOT:PSS)is water processable,thermally stable,and highly conductive,PEDOT:PSS and its composites have been considered to be one of the most promising flexible thermoelectric materials.However,the PEDOT:PSS film prepared from its commercial aqueous dispersion usually has very low conductivity,thus cannot be directly utilized for TE applications.Here,a simple environmental friendly strategy via femtosecond laser irradiation without any chemical dopants and treatments was demonstrated.Under optimal conditions,the electrical conductivity of the treated film is increased to 803.1 S cm^(-1)from 1.2 S cm^(-1)around three order of magnitude higher,and the power factor is improved to 19.0μW m^(-1)K^(-2),which is enhanced more than 200 times.The mechanism for such remarkable enhancement was attributed to the transition of the PEDOT chains from a coil to a linear or expanded coil conformation,reduction of the interplanar stacking distance,and the removal of insulating PSS with increasing the oxidation level of PEDOT,facilitating the charge transportation.This work presents an effective route for fabricating high-performance flexible conductive polymer films and wearable thermoelectric devices.
文摘PEDOT:PSS buffer layers have been processed with the standard annealing step used for organic solar cells device applications. The d.c. conductivity σ as a function of temperature for two heating rates under He and atmospheric air was studied. Moreover, the stability of the conductivity was investigated at different temperatures and environments vs time. The main results can be summarized in the following: the increase of σ due to the thermal activation of the carriers and the improvement of the crystallinity compete with the decrease of σ resulting from the irreversible structural degradation of the polymer chains promoted by the oxygen and moisture of the atmospheric air. The heat treatment time and the temperature at which the two competing mechanisms result in a maximum of the electrical conductivity have been determined and results are discussed relevant to organic optoelectronic devices containing PEDOT: PSS buffer layers.
基金supported by the Foundation of Guangzhou Science and Technology Project(B3210530)the Open Fund of the State Key Laboratory of Luminescent Materials and Devices(South China University of Technology,2019-skllmd01)。
文摘Thermoelectric(TE)energy harvesting can effectively convert waste heat into electricity,which is a crucial technology to solve energy concerns.As a promising candidate for energy conversion,poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)has gained significant attention owing to its easy doping,high transparency,and solution processability.However,the TE performance of PEDOT:PSS still needs to be further enhanced.Herein,different approaches have been applied for tuning the TE properties:(i)direct dipping PEDOT:PSS thin films in ionic liquid;(ii)post-treatment of the films with concentrated sulfuric acid(H_(2)SO_(4)),and then dipping in ionic liquid.Besides,the same bis(trifluoromethanesulfonyl)amide(TFSI)anion and different cation salts,including 1-ethyl-3-methylimidazolium(EMIM+)and lithium(Li+),are selected to study the influence of varying cation types on the TE properties of PEDOT:PSS.The Seebeck coefficient and electrical conductivity of the PEDOT:PSS film treated with H2SO4EMIM:TFSI increase simultaneously,and the resulting maximum power factor is 46.7μW·m^(-1)·K^(-2),which may be attributed to the ionic liquid facilitating the rearrangement of the molecular chain of PEDOT.The work provides a reference for the development of organic films with high TE properties.
文摘改进了聚(3,4-乙烯基二氧噻吩)/聚(苯乙烯磺酸盐)(PEDOT:PSS)的合成技术。采用对甲苯磺酸铁[(Fe(OTs)_(3))]作为催化剂,并在反应中引入磷酸三乙酯作为水溶性助剂并辅助催化反应且消泡稳黏,以优化PEDOT:PSS的成膜性能。同时,利用微通道搅拌方法制备了均匀粒径(<50 nm)的OE-004 PEDOT:PSS分散液,然后将OE-004应用于器件表征以全面评估OE-004与Clevios P VP AI 4083的性能差异并验证其适用性。研究结果表明,OE-004材料因更均匀的粒径尺寸和优化的微观配比,在PM6:L8-BO器件中表现出与Clevios P VP AI 4083基本一致的优秀空穴传输性能,实现了17.72%的最佳光电转换效率。器件复合过程研究表明OE-004呈现出良好的空穴提取和传输能力,在抑制器件内部的单分子复合或陷阱辅助复合方面表现出色。这些结果清晰验证了OE-004在有机太阳能电池中的适用性,其优异性能为空穴用PEDOT:PSS提供了理想的国产产品。
文摘聚(3,4-乙撑二氧噻吩):聚苯乙烯磺酸盐(PEDOT:PSS)具有良好的导电性和柔性,在可穿戴的柔性电致变色器件和柔性太阳能电池中显示出巨大的潜力。通过不同的化学沉积和物理掺杂可以更大的提高PEDOT:PSS的电化学性能。目前PEDOT:PSS在有机太阳能电池(Organic solar cells, OSCs)空穴传输层(HTL)的应用研究极为广泛,但是其具有低电导率、水/氧敏感、腐蚀电极等缺陷。为了追求优异的性能,常用的PEDOT:PSS空穴传输层仍需优化。本文综述了近年来PEDOT:PSS的各种改善方法和在有机太阳能电池空穴传输层中的应用研究最新进展,并介绍了PEDOT:PSS在柔性有机太阳能电池的应用。
文摘The conductivity difference Δσ between two similar PEDOT:PSS films, 120 nm thick, heated by 5 and 15 K/min from 80 to 440 K, the one under inert He and the other under ambient air gives an approximate measure of the influence of oxygen and moisture on the conductivity vs temperature T. The resulting curves Δσ = f(T) exhibit three different regions: at temperatures from 80 to 145 K for heating rate 5 K/min and from 80 to 200 K for 15 K/min, an intense degradation of the sample under ambient atmosphere was revealed by the abrupt increase of the difference of the conductivities between He and atmospheric air. At intermediate temperatures from 145 to 380 K for 5 K/min and 200 to 400 K for 15 K/min, the conductivity difference remains basically constant indicating a stabilization of the damage produced by oxygen and moisture. Finally, for temperatures higher than 380 to 400 K the degradation increases again. An explanation of this behavior is proposed based on the hydrophilic character of the PSS and the destructive role of oxygen at high temperatures. Moreover, the isotherms σ = σ(t), where t is the heating time, at 443 K, under inert He and under atmospheric air for one hour verify the significant role of oxygen and moisture on the electrical conductivity. Under He the conductivity increases monotonically with t, but under ambient air factors the conductivity competes with others decreasing it producing a maximum at about t = 10 min.
文摘Mixed Stearic acid and poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS) Langmuir- Blodgett(LB) films were successfully fabricated by the conventional vertical dipping method.Stearic acid and PEDOT/PSS was dissolved in chloroform and spread on subphase containing 0.04wt% FeCl_3.Conductive Y-type mixed LB films was successfully prepared under the condition of surface pressure with 30 mN/m,pH 3.8,and 19℃.UV-VIS spectrum showed that well ordered layer-by-layer fabrication of mixed films were obtained and thickness of single layer film with about 5 nm was evaluated.The morphology image of mixed LB film was observed by atomic force microscopy (AFM).The conductivity of mixed LB film was about 1.8×10^(-5)S/cm and the film showed sensitivity to NH_3 at the same time.
