Side-Chain Effects on Energy-Level Modulation and Device Performance of Organic Semiconductor Acceptors in Organic Solar Cells

2017 ◽  
Vol 9 (39) ◽  
pp. 34146-34152 ◽  
Author(s):  
Zhenghui Luo ◽  
Yuan Zhao ◽  
Zhi-Guo Zhang ◽  
Guanghao Li ◽  
Kailong Wu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Organic Semiconductor ◽  
Organic Solar Cells ◽  
Side Chain ◽  
Device Performance

scholarly journals Alkyl-Side-Chain Engineering of Nonfused Nonfullerene Acceptors with Simultaneously Improved Material Solubility and Device Performance for Organic Solar Cells

ACS Omega ◽  
2021 ◽  
Vol 6 (7) ◽  
pp. 4562-4573
Author(s):  
Taeho Lee ◽  
Chang Eun Song ◽  
Sang Kyu Lee ◽  
Won Suk Shin ◽  
Eunhee Lim
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Side Chain ◽  
Device Performance ◽  
Alkyl Side Chain

Green solvent-processed efficient non-fullerene organic solar cells enabled by low-bandgap copolymer donors with EDOT side chains

2019 ◽  
Vol 7 (2) ◽  
pp. 716-726 ◽  
Author(s):  
Chentong Liao ◽  
Ming Zhang ◽  
Xiaopeng Xu ◽  
Feng Liu ◽  
Ying Li ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Organic Solar Cells ◽  
Carrier Mobility ◽  
Side Chain ◽  
Ternary Blend ◽  
Side Chains ◽  
Green Solvent ◽  
Low Bandgap ◽  
Blend Morphology

By a combination of side chain and ternary blend strategies, novel BDT-TT-based copolymer donors were developed to improve the green solvent solubility, crystallinity, energy level, carrier mobility and blend morphology. Non-fullerene binary and ternary blend devices based on PTB-EDOTS exhibited high PCEs of 10.18% and 12.26%, respectively.

Improving the charge carrier transport of organic solar cells by incorporating a deep energy level molecule

2017 ◽  
Vol 19 (1) ◽  
pp. 245-250 ◽  
Author(s):  
Chunyu Liu ◽  
Zhiqi Li ◽  
Zhihui Zhang ◽  
Xinyuan Zhang ◽  
Liang Shen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Charge Carrier ◽  
Organic Solar Cells ◽  
Carrier Transport ◽  
Polymer Solar Cells ◽  
Device Performance ◽  
Charge Carrier Transport ◽  
P Type ◽  
Tcnq Molecule

A p-type F4-TCNQ molecule was incorporated into the P3HT/ICBA active layer to enhance the device performance of polymer solar cells from 4.50% to 5.83%.

Energy level engineering in ternary organic solar cells: Evaluating exciton dissociation at organic semiconductor interfaces

2017 ◽  
Vol 110 (13) ◽  
pp. 133301 ◽  
Author(s):  
Krishna Feron ◽  
Mahir N. Thameel ◽  
Mohammed F. Al-Mudhaffer ◽  
Xiaojing Zhou ◽  
Warwick J. Belcher ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Organic Semiconductor ◽  
Organic Solar Cells ◽  
Exciton Dissociation ◽  
Semiconductor Interfaces

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.

A universal approach for optimizing charge extraction in electron transporting layer-free organic solar cells via Lewis base doping

2019 ◽  
Vol 7 (45) ◽  
pp. 25808-25817
Author(s):  
Rong Wang ◽  
Boxin Wang ◽  
Jianqiu Wang ◽  
Xuning Zhang ◽  
Dongyang Zhang ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
Photovoltaic Device ◽  
Lewis Base ◽  
Device Performance ◽  
Universal Approach ◽  
Electron Transporting Layer ◽  
Charge Extraction ◽  
Base Doping

Applying anion-induced electron transfer doping with a series of TXABr salts to non-fullerene organic solar cells enables to tune the doping efficiency and photovoltaic device performance.

Fine-tuning of Side-chain Orientations on Nonfullerene Acceptors Enables Organic Solar Cells with 17.7% Efficiency

2021 ◽  
Author(s):  
Gaoda CHAI ◽  
Yuan Chang ◽  
Jianquan Zhang ◽  
Xiaopeng Xu ◽  
Liyang Yu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Fine Tuning ◽  
Side Chain

Side-chain engineering has been shown to be an important strategy to optimize Y-series nonfullerene acceptors (NFAs). Most previous reports were focusing on changing the branching positions and size of the...

Uphill and downhill charge generation from charge transfer to charge separated states in organic solar cells

2021 ◽  
Author(s):  
Shahidul Alam ◽  
Vojtech Nádaždy ◽  
Tomáš Váry ◽  
Christian Friebe ◽  
Rico Meitzner ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Solar Cells ◽  
Charge Transfer ◽  
Energy Level ◽  
Density Of States ◽  
Organic Solar Cells ◽  
Joint Density ◽  
Charge Generation ◽  
Donor Acceptor

Energy level alignments at the organic donor–acceptor interface cannot be predicted from cyclic voltammetry. Onsets for joint density of states and charge generation, reveal cases of energy uphill and – newly observed – downhill charge generation.

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