An Easy and Effective Method To Modulate Molecular Energy Level of Poly(3-alkylthiophene) for High-VocPolymer Solar Cells

2009 ◽  
Vol 42 (23) ◽  
pp. 9217-9219 ◽  
Author(s):  
Jianhui Hou ◽  
Teresa L. Chen ◽  
Shaoqing Zhang ◽  
Lijun Huo ◽  
Srinivas Sista ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Molecular Energy Level

An Easy and Effective Method to Modulate Molecular Energy Level of the Polymer Based on Benzodithiophene for the Application in Polymer Solar Cells

2013 ◽  
Vol 26 (13) ◽  
pp. 2089-2095 ◽  
Author(s):  
Maojie Zhang ◽  
Xia Guo ◽  
Wei Ma ◽  
Shaoqing Zhang ◽  
Lijun Huo ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Polymer Solar Cells ◽  
Molecular Energy Level

scholarly journals Synergistic effects of chlorination and a fully two-dimensional side-chain design on molecular energy level modulation toward non-fullerene photovoltaics

2018 ◽  
Vol 6 (7) ◽  
pp. 2942-2951 ◽  
Author(s):  
Pengjie Chao ◽  
Huan Wang ◽  
Daize Mo ◽  
Hong Meng ◽  
Wei Chen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Synergistic Effects ◽  
Side Chain ◽  
Side Chains ◽  
Two Dimensional ◽  
Molecular Energy Level

By taking the advantage of chlorination and fully conjugated side chains, 2D-PBTCl shows a PCE of up to 8.81% in non-fullerene solar cells, which corresponds to an approximately 28% improvement compared to that of PTB7-Th-based devices.

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.

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.

scholarly journals 9.0% power conversion efficiency from ternary all-polymer solar cells

2017 ◽  
Vol 10 (10) ◽  
pp. 2212-2221 ◽  
Author(s):  
Zhaojun Li ◽  
Xiaofeng Xu ◽  
Wei Zhang ◽  
Xiangyi Meng ◽  
Zewdneh Genene ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
High Performance ◽  
Polymer Solar Cells ◽  
Power Conversion ◽  
Energy Level Alignment ◽  
Proper Energy

High-performance ternary all-polymer solar cells with outstanding efficiency of 9.0% are realized by incorporating two donor and one acceptor polymers with complementary absorption and proper energy level alignment.

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