Enhanced efficiency and stability of PTB7-Th-based multi-non-fullerene solar cells enabled by the working mechanism of the coexisting alloy-like structure and energy transfer model

2019 ◽  
Vol 7 (38) ◽  
pp. 22044-22053 ◽  
Author(s):  
Sora Oh ◽  
Chang Eun Song ◽  
Taeho Lee ◽  
Ara Cho ◽  
Hang Ken Lee ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Solar Cells ◽  
Ternary Blend ◽  
Transfer Model ◽  
Working Mechanism ◽  
The Third ◽  
Host Materials ◽  
Energy Transfer Model ◽  
Nonfullerene Acceptor

A simple-structured nonfullerene acceptor (NFA), T2-ORH, consisting of a bithiophene core and octyl-substituted rhodanine ends is utilized as the third component in ternary-blend solar cells with PTB7-Th and EH-IDTBR as host materials.

scholarly journals The Effects of Molecular Packing Behavior of Small-Molecule Acceptors in Ternary Organic Solar Cells

2021 ◽  
Vol 11 (2) ◽  
pp. 755
Author(s):  
Eunhee Lim
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Ternary System ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Orbital Energy ◽  
Working Mechanism ◽  
Energy Level Structure ◽  
The Third ◽  
Molecular Backbone

Herein, two diketopyrrolopyrrole (DPP)-based, small-molecule isomers, o- and p-DPP-PhCN, were introduced as acceptors in ternary organic solar cells (OSCs). The isomers have the same molecular backbone but differ in the positions of the cyanide (CN) substituents (ortho and para), which greatly affects their packing behavior. Ternary solar cells composed of poly(3-hexylthiophene) (P3HT):DPP-PhCN:phenyl-C61-butyric acid methyl ester (PCBM) were fabricated, and the effects of the different packing behaviors of the third component on the device performance and the working mechanism of the ternary cells were investigated. The addition of o-DPP-PhCN with a relatively high-lying lowest unoccupied molecular orbital energy level resulted in an increase in the open-circuit voltage (VOC) in the ternary devices, demonstrating the alloy-like structure of the two acceptors (o-DPP-PhCN and PCBM) in the ternary system. However, the p-DPP-PhCN-based ternary cells exhibited VOC values similar to that of a P3HT:PCBM binary cell, irrespective of the addition of p-DPP-PhCN, indicating a cascade energy-level structure in the ternary system and an effective charge transfer from the P3HT to the PCBM. Importantly, by increasing the addition of p-DPP-PhCN, the short-circuit current density increased substantially, resulting in pronounced shoulder peaks in the external quantum efficiency responses in the long-wavelength region, corresponding to the contribution of the photocurrent generated by the light absorption of p-DPP-PhCN. Despite sharing the same molecular backbone, the two DPP-PhCNs exhibited substantially different packing behaviors according to the position of their CN substituents, which also greatly affected the working mechanism of the ternary devices fabricated using the DPP-PhCNs as the third component.

Cooperative Pair Driven Quenching of Yb3+ Emission in Nanocrystalline ZrO2:Yb3+

2009 ◽  
Vol 5 ◽  
pp. 121-134 ◽  
Author(s):  
O. Meza ◽  
L.A. Diaz-Torres ◽  
P. Salas ◽  
E. De la Rosa ◽  
C. Ángeles-Chávez ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Crystalline Phase ◽  
Luminescence Quenching ◽  
Interaction Parameters ◽  
Transfer Model ◽  
Geometrical Construction ◽  
Transfer Processes ◽  
Nir Emission ◽  
Energy Transfer Model ◽  
Cooperative Energy

The concentration luminescence quenching of the NIR emission of Yb3+ in nanocrystalline ZrO2 is studied. It is found that the quenching is dominated by cooperative energy transfer processes from isolated Yb3+ ions to Yb-Yb pairs (Yb dimers). The Yb dimer concentration depends on the crystallite phase and size, which on time depends on Yb concentration. An extended energy transfer model was developed to predict the IR and cooperative visible fluorescence emissions by taking in to account the crystalline phase, the nanocrystals size, and the geometrical construction of Yb dimers. Our model succeeds to fit simultaneously both experimental VIS and NIR emissions, and the corresponding interaction parameters are reported.

scholarly journals High-Performance Ternary Organic Solar Cells Enabled by Combining Fullerene and Nonfullerene Electron Acceptors

2019 ◽  
Vol 01 (01) ◽  
pp. 030-037 ◽  
Author(s):  
Jianyun Zhang ◽  
Wenrui Liu ◽  
Shengjie Xu ◽  
Xiaozhang Zhu
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
High Performance ◽  
Power Conversion ◽  
Wide Bandgap ◽  
The Third ◽  
Bimolecular Recombination ◽  
Conversion Efficiencies ◽  
Wide Bandgap Polymer ◽  
Nonfullerene Acceptor

Recently, by elaborately designing nonfullerene acceptors and selecting suitable polymer donors great progresses have been made towards binary organic solar cells (OSCs) with power conversion efficiencies (PCEs) over 15%. Ternary organic photovoltaics by introducing a third component into the host binary system is recognized to be highly effective to elevate the performance through extending the light absorption, manipulating the recombination behavior of the carriers, and improving the morphology of the active layer. In this work, we synthesized a new electron-acceptor ZITI-4F matching it with the wide-bandgap polymer donor PBDB-T The PBDB-T:ZITI-4F-based OSC showed a high PCE of 12.33%. After introducing 40% of PC71BM as the third component, the ternary device achieved an improved PCE of 13.40% with simultaneously improved photovoltaic parameters. The higher performance of the ternary device can be attributed to the improved and more balanced charge mobility, reduced bimolecular recombination, and more favorable morphology. These results indicate that the cooperation of a fullerene-based acceptor and a nonfullerene acceptor to fabricate ternary OSCs is an effective approach to optimizing morphology and therefore to increase the performance of OSCs.

Energy transfer in ternary blend organic solar cells: recent insights and future directions

2021 ◽  
Author(s):  
Aiswarya Abhisek Mohapatra ◽  
Vivek Tiwari ◽  
Satish Patil
Keyword(s):  
Energy Transfer ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Ternary Blend ◽  
Future Directions ◽  
Photosynthetic Proteins

Resonance energy transfer in ternary blend organic solar cells is discussed by drawing parallels from natural photosynthetic proteins.

The Research on Loading Effect of Energy Transfer Model-Based QCM Immunosensor

2013 ◽  
Vol 401-403 ◽  
pp. 1149-1152
Author(s):  
Yan Chen ◽  
Xian He Huang
Keyword(s):  
Energy Transfer ◽  
Theoretical Basis ◽  
Quartz Crystal ◽  
Functional Relationship ◽  
Maximum Amplitude ◽  
Quartz Resonator ◽  
Transfer Model ◽  
Mass Loading ◽  
Absolute Viscosity ◽  
Energy Transfer Model

To improve the accuracy of quartz crystal microbalance (QCM) immunosensor, it is the key to distinguish accurately and effectively about the effects of mass loading and damping loading of a quartz resonator vibrating in damping environment. The energy transfer model (ETM) is introduced to deduce functional relationship between the product of absolute viscosity and density of the liquid deposit and the maximum amplitude of vibration at the quartz-resonator surface. Then the effect of mass loading can be rapidly distinguished from damping loading by measuring the frequency shift and the amplitude of QCM. This method provides a new theoretical basis for the application of QCM immunosensor in medical diagnosis, especially in tumor diagnosis.

scholarly journals A New Nonfullerene Acceptor with Near Infrared Absorption for High Performance Ternary-Blend Organic Solar Cells with Efficiency over 13%

2018 ◽  
Vol 5 (6) ◽  
pp. 1800307 ◽  
Author(s):  
Huan-Huan Gao ◽  
Yanna Sun ◽  
Xiangjian Wan ◽  
Xin Ke ◽  
Huanran Feng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Infrared Absorption ◽  
Organic Solar Cells ◽  
High Performance ◽  
Near Infrared ◽  
Ternary Blend ◽  
Nonfullerene Acceptor
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