Saturable absorption properties of the SnS2/FTO thin film

Organic phototransistors capable of absorbing in the visible light spectrum without color filters are the best alternatives to conventional inorganic phototransistors. In this study, the effect of illumination on the electrical characteristics of a solution-processed poly(3-hexylthiophene): 6,13-bis(triisopropylsilylethynyl) pentacene-blend thin-film transistor (TFT) was investigated. The wavelengths of the irradiated light were determined from the absorbance spectrum of the blended film and changes in the transistor’s electrical characteristics were explained in relation to the electrical and light absorption properties of each component material. The photosensitivity and absorbing properties of the blended TFT were enhanced at 515 and 450 nm and exhibited positively shifted threshold voltages under incident light. The results indicated that the photo-generated exci-ton pair characteristics matched the absorbance properties of the blended material and that the absorption and photocurrent characteristics of the respective components could be combined. This process for the heterogeneous blending of organic semiconductors has the potential to improve phototransistor performance and contribute to the development of broadband absorbing phototransistors.

Download Full-text

Graphene/MoS2 organic glasses: Fabrication and enhanced reverse saturable absorption properties

Optical Materials ◽

10.1016/j.optmat.2013.06.033 ◽

2013 ◽

Vol 35 (12) ◽

pp. 2352-2356 ◽

Cited By ~ 20

Author(s):

Qiuyun Ouyang ◽

Hailong Yu ◽

Hongyu Wu ◽

Zhenyu Lei ◽

Lihong Qi ◽

...

Keyword(s):

Saturable Absorption ◽

Reverse Saturable Absorption ◽

Absorption Properties ◽

Organic Glasses

Download Full-text

Graphdiyne Saturable Absorber for Passively Q-Switched Ho3+-Doped Laser

Nanomaterials ◽

10.3390/nano10091848 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1848

Author(s):

Cheng Zhang ◽

Qianqian Hao ◽

Yuqian Zu ◽

Mengyu Zong ◽

Jia Guo ◽

...

Keyword(s):

Saturable Absorber ◽

Pulse Width ◽

Optical Modulator ◽

Saturable Absorption ◽

Carbon Nanostructure ◽

Absorption Properties ◽

Promising Candidate ◽

Average Output ◽

Short Pulses ◽

Maximum Average Output Power

High-quality all-carbon nanostructure graphdiyne (GDY) saturable absorber was successfully fabricated and saturable absorption properties in the 2 μm region were characterized using a commercial mode-locked laser as a pulsed source. The fabricated GDY was first used as an optical switcher in a passively Q-switched Ho laser. Under absorbed pump power of 2.4 W, the maximum average output power and shortest pulse width were 443 mW and 1.38 µs, at a repetition rate of 29.72 kHz. The results suggest that GDY nanomaterial is a promising candidate as an optical modulator for generation of short pulses in Ho-doped lasers at 2.1 μm.

Download Full-text

Nonlinear Absorption Properties of Spherical Gold Colloidal Nanoparticles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.476-478.923 ◽

2012 ◽

Vol 476-478 ◽

pp. 923-927 ◽

Cited By ~ 1

Author(s):

Chan Zheng ◽

Xiao Yun Ye ◽

Xue Qing Xiao

Keyword(s):

Nonlinear Absorption ◽

Laser Pulses ◽

Phase Method ◽

Saturable Absorption ◽

Reverse Saturable Absorption ◽

Colloidal Nanoparticles ◽

Free Carrier Absorption ◽

Absorption Properties ◽

Liquid Phase Method ◽

Carrier Absorption

Spherical gold colloidal nanoparticles were prepared used traditional liquid phase method and the corresponding nonlinear absorption properties were investigated by open aperture Z-scan technique using 8 ns laser pulses of 532 nm. The gold colloidal nanoparticles exhibited a transform from saturable absorption (SA) to reverse saturable absorption (RSA) at relatively higher irradiation intensities. The SA behavior presumably owes to the bleach of ground-state surface plasmon resonance (SPR) absorption, while the RSA might result from high excited-stated free carrier absorption.

Download Full-text

Infrared Absorption Properties of Carbon Nanotube/Nanodiamond Based Thin Film Coatings

Journal of Microelectromechanical Systems ◽

10.1109/jmems.2013.2266411 ◽

2014 ◽

Vol 23 (1) ◽

pp. 191-197 ◽

Cited By ~ 33

Author(s):

Vikrant Jayant Gokhale ◽

Olga A. Shenderova ◽

Gary E. McGuire ◽

Mina Rais-Zadeh

Keyword(s):

Thin Film ◽

Carbon Nanotube ◽

Infrared Absorption ◽

Absorption Properties ◽

Film Coatings ◽

Thin Film Coatings

Download Full-text

Modification of Optophysical Properties of Poly[(9,9-Di-N-Octylfluorenyl-2,7-Diyl)-Alt-(Benzo[2,1,3]Thiadiazol-4,8-Diyl)] Thin Film via Additions of TiO2 Nanoparticles

Materials Science Forum ◽

10.4028/www.scientific.net/msf.888.357 ◽

2017 ◽

Vol 888 ◽

pp. 357-361

Author(s):

Siti Aishah Ahmad Fuzi ◽

Mohammad Hafizuddin Hj Jumali ◽

Bandar Ali Al-Asbahi ◽

Kuan Ying Kok ◽

Nur Ubaidah Saidin

Keyword(s):

Thin Film ◽

Optical Properties ◽

Emission Spectrum ◽

Polymer Matrix ◽

Energy Band ◽

Intermediate Energy ◽

Absorption Properties ◽

Glass Substrates ◽

Solution Blending ◽

Vis Spectroscopy

The solution of poly [(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo [2,1,3] thiadiazol-4,8-diyl)] (F8BT) F8BT/TiO2 nanocomposites were prepared using solution blending methods. The TiO2 contents were fixed between 0 wt% - 35 wt%. Then, the solutions were spin coated at 1000 rpm for 30 s onto glass substrates to form thin film samples. The optical properties of the nanocomposites were determined using UV-Vis spectroscopy and photoluminescence spectroscopy. The absorption properties of the thin film increased due to existence of intermediate energy band which lead to higher space charge regions for electron insertion. Besides that, the λmax for absorption and emission spectrum were systematically shifted due to incorporation of TiO2 NPs indicating an interaction between nanoparticles and polymer matrix. Furthermore, the intensity of the emission spectrum were enhanced in the presence of TiO2 NPs. This is due to the existence of TiO2 NPs which trapped more electrons at the interface F8BT/TiO2, resulted production of higher number of exciton formation in the nanocomposirte samples.

Download Full-text