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Multifunctional Molecular Material Combining photocurrent generation and Second-Order Optical Nonlinearity in LB Monolayer Films

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Chinese Journal of Chemistry 2002年第11期20卷 1162-1167,1125页

作者：李富友黄岩谊黄春辉金林培赵新生柳汀汀 State Key Laboratory of Rare Earth Materials Chemistry and Applications Peking University‐The University of Hong Kong Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry Peking University Beijing 100871 China Department of Chemistry Beijing Normal University Beijing 100875 China Department of Chemistry Peking University Beijing 100871 China

A novel amphiphilic stilbazolium dye, (E)-N-methyl-4-[2-(4-N-methyl-N-hexadecylaminophenyl) ethenyl]-2-isoquinolinium iodide (MHIQ), was synthesized. The dye was successfully transferred onto ITO electrode or quartz by the Langmuir-Blodgett (LB) technique. The second harmonic generation (SHG) and photocurrent generation properties of the LB film transferred under 35 mN/m of surface pressure were investigated. The broad absorption maximum of the LB monolayer of MHIQ at 434 nm is far away from the wavelength (532 nm) of resonant enhancement effect, and its second harmonic susceptibility x(2) is 167 pm/V, which means that the isoquinolinium is a good electron-accepting group. The photocurrent generation experiment shows that the photocurrent generation properties are dependent on the experimental conditions including bias voltage, redox couples and light intensity. By a light irradiation at 440 nm, the photocurrent generation quantum yields of the dye LB monolayer are 0.50% in 0.5 mol/L KG electrolyte solution and 17.5% in 0.1 mol/L KI electrolyte solution with 0.01 mol/L I2, respectively, indicating that the dye MHIQ is a good photoelectric conversion material.

关键词： multifunctional photocurrent generation LB film second harmonic generation

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Enhanced photocurrent generation of Graphene/Au@ZnO Honeycomb Film

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Chinese Journal of Chemistry 2017年第10期35卷 1627-1632页

作者： Hang Sun Qinrong He Shengyan Yin Kongliang Xu Key Laboratory of Bionic Engineering (Ministry of Education) College of Biological and Agricultural Engineering Jilin University Changchun Jilin 130022 China State Key Laboratory on Integrated Optoelectronics College of Electronic Science & Engineering Jilin University Changchun 130012 China

A bio-inspired graphene/Au@ZnO photoelectrode has been prepared via breath figure method, in which Au@ZnO nanospheres were uniformly distributed in the whole honeycomb film. The size of the honeycomb holes effects the light using efficiency. The honeycomb film with smaller holes in more ordered array shows better antire- flective property. All the formed graphene/Au@ZnO honeycomb photoelectrodes show a fast, stable, and reversible response of photocurrent accompanied by each switch-on and switch-off event. Au@ZnO-modified graphene hon- eycomb film can combine the advantages of increased light harvesting provided by honeycomb structure, efficient charge separation from Au nanoparticles （NPs）, and efficient electron transfer provided by graphene. Au@ZnO- modified graphene honeycomb film shows a two-fold increase of photocurrent generation than ZnO-modified gra- phene honeycomb film and a three-fold increase of photocurrent generation than Au@ZnO-modified graphene smooth film, respectively. The rational design and engineering of multi components with different functions in a hybrid bio-inspired structure hold great promise for further efficient solar energy conversion devices.

关键词： honeycomb structure zinc oxide graphene nanostructures photocurrent generation

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Surface plasmon excitation in semitransparent inverted polymer photovoltaic devices and their applications as label-free optical sensors

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Light(Science & Applications) 2014年第1期3卷 5-12页

作者： Byoungchoo Park Soo Hong Yun Chan Youn Cho Young Chan Kim Jung Chul Shin Hong Goo Jeon Yoon Ho Huh Inchan Hwang Ku Youn Baik Young In Lee Han Sup Uhm Guang Sup Cho Eun Ha Choi Department of Electrical and Biological Physics Kwangwoon UniversitySeoul 139-701Republic of Korea Department of Electronic Materials Engineering Kwangwoon UniversitySeoul 139-701Republic of Korea

Herein,we report on surface plasmon(SP)-sensitive semitransparent inverted polymer photovoltaic(PV)devices that are based on multilayered material systems consisting of poly(3-hexylthiophene):fullerene-derivative bulk-heterojunction PV layers and thin gold or silver anodes.We demonstrate that these PV devices allow the simultaneous generation of both electrical power and SPs on their anodes for photoexcitation just above the optical absorption edge of the PV layers,resulting not only in attenuated total reflection,but also in attenuated photocurrent generation(APG)under the SP resonance(SPR)condition.Moreover,we also confirm that the biomolecular interaction of biotin–streptavidin on the PV devices can be precisely detected via apparent SPR angle shifts in the APG spectra,even without the need for complex attenuated total reflection configurations.We highlight our view that APG measurements made using these PV devices show great potential for the development of future generations of compact and highly sensitive SPR-based optical sensors.

关键词： attenuated total reflection optical sensors photocurrent generation polymer photovoltaic devices surface plasmon

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