scholarly journals Towards Highly Efficient TADF Yellow-Red OLEDs Fabricated by Solution Deposition Methods: Critical Influence of the Active Layer Morphology

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 101 ◽  
Author(s):  
Manish Kumar ◽  
Luiz Pereira
Keyword(s):  
Active Layer ◽  
Power Efficiency ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Organic Layer ◽  
Solution Processing ◽  
Host Matrix ◽  
Highly Efficient ◽  
Red Oleds ◽  
P Type

Organic light-emitting diodes (OLEDs) based on thermally activated delayed fluorescence emitters (TADF) in simple device structures fabricated by solution processing are strongly dependent on a suitable host molecular conformation and morphology. Herein, we report the fabrication of highly efficient yellow-red TADF-based OLEDs via solution processing in a simple, two-organic-layer device structure. The devices were fabricated at different weight concentrations of 5%, 8%, and 10% emitter in an n-/p-type mixed host matrix, and their characteristics were studied. The device performance was compared with different thickness parameters for both the emitting layer (EML) and the electron transport layer (ETL) in various solvents, including chlorobenzene, dichlorobenzene, and chloroform. By optimizing the mixed ratio of EML, yellow-red OLEDs of 2-[4 (diphenylamino)phenyl]-10,10-dioxide-9H-thioxanthen-9-one (TXO-TPA) emitter in an n-/p-type host matrix of poly(N-vinylcarbazole):1,3-Bis[2-(4-tert-butylphenyl)-1,3,4-oxadiazo-5-yl]benzene (PVK:OXD-7) as a blend for the active layer were fabricated. In the best results, the device exhibited a lower turn-on voltage at around 6 V, with an external quantum efficiency (EQE) of 18.44%, current efficiency of 36.71 cd/A, and power efficiency of 14.74 Lm/W for the 8% emitter concentration. The importance of solvent for improving the electrical properties, together with organic layer thickness and host effect for the charge carrier’s transport and device characteristics are also discussed.

p-Type CuI Islands on TiO2 Electron Transport Layer for a Highly Efficient Planar-Perovskite Solar Cell with Negligible Hysteresis

2017 ◽  
Vol 8 (5) ◽  
pp. 1702235 ◽  
Author(s):  
Mahdi Malekshahi Byranvand ◽  
Taewan Kim ◽  
Seulki Song ◽  
Gyeongho Kang ◽  
Seung Un Ryu ◽  
...  
Keyword(s):  
Solar Cell ◽  
Electron Transport ◽  
Perovskite Solar Cell ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Highly Efficient ◽  
P Type

scholarly journals Highly efficient organic solar cells enabled by a porous ZnO/PEIE electron transport layer with enhanced light trapping

2020 ◽  
Vol 64 (4) ◽  
pp. 808-819
Author(s):  
Shenya Qu ◽  
Jiangsheng Yu ◽  
Jinru Cao ◽  
Xin Liu ◽  
Hongtao Wang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Transport ◽  
Organic Solar Cells ◽  
Light Trapping ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Highly Efficient

Attainment of Stable (FTO/ZnO/CdS/CH3NH3SnI3/GaAs/Au) Perovskite Solar Cell With Above 23% Photovoltaic Performance Using Solar Capacitance Simulator

2021 ◽  
Author(s):  
Irfan Qasim ◽  
Owais Ahmad ◽  
Asim Rashid ◽  
Tashfeen Zehra ◽  
Muhammad Imran Malik ◽  
...  
Keyword(s):  
Solar Cells ◽  
Defect Density ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Hole Transport ◽  
Transport Layer ◽  
Buffer Layers ◽  
Electron Transport Layer ◽  
Device Performance ◽  
Highly Efficient

Abstract Solar energy is found to be low cost and abundant of all available energy resources and needs exploration of highly efficient devices for global energy requirements. We have investigated methyl ammonium tin halide (CH3NH3SnI3)-based perovskite solar cells (PSCs) for optimized device performance using solar capacitance simulator SCAPS-1D software. This study is a step forward towards availability of stable and non-toxic solar cells. We explored all necessary parameters such as metal work functions, thickness of absorber and buffer layers, charge carrier’s mobility and defect density for improved device performance. Calculations revealed that for the best efficiency of device the maximum thickness of the perovskite absorber layer must be 4.2 μm. Furthermore, optimized thickness values of (ZnO=0.01 μm) as electron transport layer (ETL), GaAs as hole transport layer (HTL=3.02 μm) and (CdS=10 nm) and buffer layer have provided power conversion efficiency (PCE) of 23.53%. Variation of open circuit voltage (Voc), Short circuit current (Jsc), Fill Factor (FF%) and quantum efficiency against thickness of all layers in FTO/ZnO/CdS/CH3NH3SnI3/GaAs/Au compositions have been critically explored and reported. Interface defects and defect density in different inserted layers have also been reported in this study as they can play a crucial for the device performance. Insertion of ZnO layer and CdS buffer layers have shown improved device performance and PCE. Current investigations may prove to be useful for designing and fabrication of climate friendly, non-toxic and highly efficient solar cells.

Nanocomposite Electron-Transport Layer Incorporated Highly Efficient OLED

2020 ◽  
Vol 2 (6) ◽  
pp. 1545-1553
Author(s):  
Mangey Ram Nagar ◽  
Shahnawaz ◽  
Rohit Ashok Kumar Yadav ◽  
Jin-Ting Lin ◽  
Jwo-Huei Jou
Keyword(s):  
Electron Transport ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Highly Efficient

A Benzodithiophene-Based Novel Electron Transport Layer for a Highly Efficient Polymer Solar Cell

2014 ◽  
Vol 6 (18) ◽  
pp. 15875-15880 ◽  
Author(s):  
Hong Il Kim ◽  
Thi Thu Trang Bui ◽  
Guan-Woo Kim ◽  
Gyeongho Kang ◽  
Won Suk Shin ◽  
...  
Keyword(s):  
Solar Cell ◽  
Electron Transport ◽  
Polymer Solar Cell ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Highly Efficient

Self‐Assembled Ionic Liquid for Highly Efficient Electron Transport Layer‐Free Perovskite Solar Cells

ChemSusChem ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2779-2785 ◽  
Author(s):  
Haoliang Cheng ◽  
Yaru Li ◽  
Meirong Zhang ◽  
Ke Zhao ◽  
Zhong‐Sheng Wang
Keyword(s):  
Ionic Liquid ◽  
Solar Cells ◽  
Electron Transport ◽  
Perovskite Solar Cells ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Highly Efficient ◽  
Self Assembled

A sandwich-like electron transport layer to assist highly efficient planar perovskite solar cells

Nanoscale ◽  
2019 ◽  
Vol 11 (45) ◽  
pp. 21917-21926 ◽  
Author(s):  
Zhichao Lin ◽  
Jingjing Yan ◽  
Qingbin Cai ◽  
Xiaoning Wen ◽  
Hongye Dong ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Transport ◽  
Metal Oxides ◽  
Organic Molecules ◽  
Perovskite Solar Cells ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Highly Efficient

Co-modification of an electron transport layer (ETL) with metal oxides and organic molecules can optimize the structure of the ETL and improve the performance of perovskite solar cells (PSCs).

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