scholarly journals Fabrication and Photovoltaic Properties of Organic Solar Cell Based on Zinc Phthalocyanine

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 962 ◽  
Author(s):  
Zahoor Ul Islam ◽  
Muhammad Tahir ◽  
Waqar Adil Syed ◽  
Fakhra Aziz ◽  
Fazal Wahab ◽  
...  
Keyword(s):  
Thin Films ◽  
Thick Film ◽  
Indium Tin Oxide ◽  
Hole Transport ◽  
Transport Layer ◽  
Zinc Phthalocyanine ◽  
Hole Transport Layer ◽  
Interfacial Resistance ◽  
Ito Cell ◽  
Photovoltaic Properties

Herein, we report thin films’ characterizations and photovoltaic properties of an organic semiconductor zinc phthalocyanine (ZnPc). To study the former, a 100 nm thick film of ZnPc is thermally deposited on quartz glass by using vacuum thermal evaporator at 1.5 × 10−6 mbar. Surface features of the ZnPc film are studied by using scanning electron microscope (SEM) with in situ energy dispersive x-ray spectroscopy (EDS) analysis and atomic force microscope (AFM) which reveal uniform film growth, grain sizes and shapes with slight random distribution of the grains. Ultraviolet-visible (UV-vis) and Fourier Transform Infrared (FTIR) spectroscopies are carried out of the ZnPc thin films to measure its optical bandgap (1.55 eV and 3.08 eV) as well as to study chemical composition and bond-dynamics. To explore photovoltaic properties of ZnPc, an Ag/ZnPc/PEDOT:PSS/ITO cell is fabricated by spin coating a 20 nm thick film of hole transport layer (HTL)—poly-(3,4-ethylenedioxythiophene) poly(styrene sulfonic acid) (PEDOT:PSS)—on indium tin oxide (ITO) substrate followed by thermal evaporation of a 100 nm layer of ZnPc and 50 nm silver (Ag) electrode. Current-voltage (I-V) properties of the fabricated device are measured in dark as well as under illumination at standard testing conditions (STC), i.e., 300 K, 100 mW/cm2 and 1.5 AM global by using solar simulator. The key device parameters such as ideality factor (n), barrier height ( ϕ b ), junction/interfacial resistance (Rs) and forward current rectification of the device are measured in the dark which exhibit the formation of depletion region. The Ag/ZnPc/PEDOT:PSS/ITO device demonstrates good photovoltaic characteristics by offering 0.48 fill factor (FF) and 1.28 ± 0.05% power conversion efficiency (PCE), η.

Formation of Ohmic Carrier Injection at Anode/organic Interfaces and Carrier Transport Mechanisms of Organic Thin Films

2009 ◽  
Vol 1154 ◽  
Author(s):  
Toshinori Matsushima ◽  
Guang-He Jin ◽  
Yoshihiro Kanai ◽  
Tomoyuki Yokota ◽  
Seiki Kitada ◽  
...  
Keyword(s):  
Thin Films ◽  
Indium Tin Oxide ◽  
Carrier Transport ◽  
Organic Thin Films ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Injection ◽  
Hole Transport Layer ◽  
Zero Field ◽  
Carrier Injection

AbstractWe have shown that hole mobilities of a wide variety of organic thin films can be estimated using a steady-state space-charge-limited current (SCLC) technique due to formation of Ohmic hole injection by introducing a very thin hole-injection layer of molybdenum oxide (MoO3) between an indium tin oxide anode layer and an organic hole-transport layer. Organic hole-transport materials used to estimate hole mobilities are 4,4′,4″-tris(N-3-methylphenyl-N-phenyl-amino)triphenylamine (m-MTDATA), 4,4′,4″-tris(N-2-naphthyl-N-phenyl-amino)triphenylamine (2-TNATA), rubrene, N,N′-di(m-tolyl)-N,N′-diphenylbenzidine (TPD), and N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4′-diamine (α-NPD). These materials are found to have electric-field-dependent hole mobilities. While field dependence parameters (β) estimated from SCLCs are almost similar to those estimated using a widely used time-of-flight (TOF) technique, zero field SCLC mobilities (μ0) are about one order of magnitude lower than zero field TOF mobilities.

Simulation and Optimization of C60-Based Organic Light-Emitting Diodes

2021 ◽  
Vol 1026 ◽  
pp. 142-146
Author(s):  
Shuo Wang
Keyword(s):  
Indium Tin Oxide ◽  
Light Emitting Diodes ◽  
Hole Transport ◽  
Organic Light Emitting Diodes ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Optical Parameters ◽  
Light Emitting ◽  
Simulation And Optimization ◽  
Organic Light

In this work we present a detailed analysis of the current-voltage variance from tris(8-hydroxyquinoline)aluminum (Alq3) based organic light emitting diodes using general-purpose photovoltaic device model (GPVDM) software as a function of: the choice of C60, the thickness of emission layer and hole-transport layer. The electrical and optical parameters of all layers were extracted from the material directory available in GPVDM. The calculations fully consider dispersion in glass substrate, indium tin oxide anode, the organic layers as well as the dispersion in the metal cathode. As expected, applied voltage was strongly dependent on the thickness of the function layer inside the devices. Finally, guidelines for designing devices with optimum turn-on voltage and thickness are presented.

Electroactive and Photoactive Rod-Coil Block Copolymers: Self-Organization and Photophysical Properties

1997 ◽  
Vol 488 ◽  
Author(s):  
X. Linda Chen ◽  
Samson A. Jenekhe
Keyword(s):  
Thin Films ◽  
Block Copolymers ◽  
Photophysical Properties ◽  
Block Size ◽  
Hole Transport ◽  
Transport Layer ◽  
Self Organization ◽  
Hole Transport Layer ◽  
High Quantum Efficiency ◽  
Free Hole

AbstractTwo series of new electroactive and photoactive coil-rod-coil and rod-coil-rod triblock copolymers, poly (pentadecamethylene carboxester)-block - poly(p-phenylene benzobisthiazole) - block - poly (pentadecamethylene carboxester) (1), and poly(2,6-benzoxazole)-block poly(benzobisthiazole decamethylene)-block-poly(2,6-benzoxazole) (2), were synthesized, characterized, and used to investigate the self-assembly properties of rod-coil block copolymers. The progressive band narrowing of the absorption spectrum of thin films of 1 confirmed the effects of spatial confinement with increasing coil block size. Photoluminescence studies of thin films of 1 and 2 showed the effects of self-organization, annealing at 110 °C, block lengths, and composition on photophysical properties. Bilayer photoreceptors consisting of a layer of block copolymer as the charge generation layer and a layer of tris(p-tolyl)amine dispersed in polycarbonate as a trap-free hole transport layer were oberved to have high quantum efficiency, good photosensitivity and good dark decay.

High-performance perovskite/Cu(In,Ga)Se2 monolithic tandem solar cells

Science ◽  
2018 ◽  
Vol 361 (6405) ◽  
pp. 904-908 ◽  
Author(s):  
Qifeng Han ◽  
Yao-Tsung Hsieh ◽  
Lei Meng ◽  
Jyh-Lih Wu ◽  
Pengyu Sun ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Short Circuit ◽  
Critical Role ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Ambient Conditions ◽  
Photovoltaic Properties ◽  
Tandem Solar Cells

The combination of hybrid perovskite and Cu(In,Ga)Se2 (CIGS) has the potential for realizing high-efficiency thin-film tandem solar cells because of the complementary tunable bandgaps and excellent photovoltaic properties of these materials. In tandem solar device architectures, the interconnecting layer plays a critical role in determining the overall cell performance, requiring both an effective electrical connection and high optical transparency. We used nanoscale interface engineering of the CIGS surface and a heavily doped poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) hole transport layer between the subcells that preserves open-circuit voltage and enhances both the fill factor and short-circuit current. A monolithic perovskite/CIGS tandem solar cell achieved a 22.43% efficiency, and unencapsulated devices under ambient conditions maintained 88% of their initial efficiency after 500 hours of aging under continuous 1-sun illumination.

Loss Process in Efficiency of Blue Organic Electroluminescent Devices

2003 ◽  
Vol 771 ◽  
Author(s):  
Yasuo Enatsu ◽  
Chimed Ganzorig ◽  
Masamichi Fujihira
Keyword(s):  
Indium Tin Oxide ◽  
Copper Phthalocyanine ◽  
Radical Cations ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Electroluminescent Devices ◽  
Chemically Modified ◽  
Excess Electrons ◽  
Organic Electroluminescent

AbstractWe report EL characteristics of blue organic electroluminescent (EL) devices with a hole transport layer (HTL) as an emitter i.e. ITO/NPD/BCP/Alq3/Cs(0.5 nm)/Al. Here, ITO, NPD, BCP, and Alq3 are abbreviations for indium-tin-oxide, 4,4'-bis[N-(1-naphthyl)-N-phenylamino]- biphenyl, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, and tris(8-hydroxyquinoline) aluminum, respectively. Three different chemically modified ITO electrodes were used. As a hole-injecting buffer layer, copper phthalocyanine (CuPc) or 4,4',4''-tris-(3-methylphenylphenylamino) triphenylamine (MTDATA) was used in this study. We found that the luminance increased less than linearly with an increase in current for all EL devices studied even when hole and electron injection were enhanced. The luminance loss in the device is attributed to quenching singlet excited states (1NPD*) by large excess radical cations (NPD+.) accumulated in the emission zone due to large overlap between a fluorescence spectrum of 1NPD* and an absorption spectrum of NPD+.. In addition, 1NPD* can be also quenched by radical anions (NPD-.) when excess electrons are injected.

scholarly journals Low temperature-processed ZnO thin films for p–n junction-based visible-blind ultraviolet photodetectors

RSC Advances ◽  
2018 ◽  
Vol 8 (65) ◽  
pp. 37365-37374 ◽  
Author(s):  
Hanna B. ◽  
Surendran K. P. ◽  
Narayanan Unni K. N.
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Hole Transport ◽  
Transport Layer ◽  
Zno Thin Films ◽  
Hole Transport Layer ◽  
Ultraviolet Photodetectors ◽  
Visible Blind

Visible-blind ultraviolet photodetectors have been fabricated with a p–n junction based on ZnO and an organic hole transport layer.

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