Effect of electron-withdrawing terminal group on BDT-based donor materials for organic solar cells: a theoretical investigation

2018 ◽  
Vol 137 (5) ◽  
Author(s):  
Lu-Lu Fu ◽  
Hua Geng ◽  
Guo Wang ◽  
Yu-Ai Duan ◽  
Yun Geng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Theoretical Investigation ◽  
Organic Solar Cells ◽  
Terminal Group

Effects of Substituents on Transport Properties of Molecular Materials for Organic Solar Cells: A Theoretical Investigation

2016 ◽  
Vol 29 (2) ◽  
pp. 673-681 ◽  
Author(s):  
Domenico Alberga ◽  
Ilaria Ciofini ◽  
Giuseppe Felice Mangiatordi ◽  
Alfonso Pedone ◽  
Gianluca Lattanzi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Transport Properties ◽  
Theoretical Investigation ◽  
Organic Solar Cells ◽  
Molecular Materials

High‐Efficiency As‐Cast Organic Solar Cells Based on Acceptors with Steric Hindrance Induced Planar Terminal Group

2019 ◽  
Vol 9 (32) ◽  
pp. 1901280 ◽  
Author(s):  
Yahui Liu ◽  
Miao Li ◽  
Jinjin Yang ◽  
Wenyue Xue ◽  
Shiyu Feng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Steric Hindrance ◽  
Organic Solar Cells ◽  
High Efficiency ◽  
Terminal Group

scholarly journals Effect of the π-conjugation length on the properties and photovoltaic performance of A–π–D–π–A type oligothiophenes with a 4,8-bis(thienyl)benzo[1,2-b:4,5-b′]dithiophene core

2016 ◽  
Vol 12 ◽  
pp. 1788-1797 ◽  
Author(s):  
Ni Yin ◽  
Lilei Wang ◽  
Yi Lin ◽  
Jinduo Yi ◽  
Lingpeng Yan ◽  
...  
Keyword(s):  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Organic Solar Cells ◽  
Energy Levels ◽  
Power Conversion ◽  
Photovoltaic Performance ◽  
Terminal Group ◽  
Absorption Bands ◽  
Conjugated Molecules

Benzo[1,2-b:4,5-b′]dithiophene (BDT) is an excellent building block for constructing π-conjugated molecules for the use in organic solar cells. In this paper, four 4,8-bis(5-alkyl-2-thienyl)benzo[1,2-b:4,5-b′]dithiophene (TBDT)-containing A–π–D–π–A-type small molecules (COOP-nHT-TBDT, n = 1, 2, 3, 4), having 2-cyano-3-octyloxy-3-oxo-1-propenyl (COOP) as terminal group and regioregular oligo(3-hexylthiophene) (nHT) as the π-conjugated bridge unit were synthesized. The optical and electrochemical properties of these compounds were systematically investigated. All these four compounds displayed broad absorption bands over 350–600 nm. The optical band gap becomes narrower (from 1.94 to 1.82 eV) and the HOMO energy levels increased (from −5.68 to −5.34 eV) with the increase of the length of the π-conjugated bridge. Organic solar cells using the synthesized compounds as the electron donor and PC61BM as the electron acceptor were fabricated and tested. Results showed that compounds with longer oligothiophene π-bridges have better power conversion efficiency and higher device stability. The device based on the quaterthiophene-bridged compound 4 gave a highest power conversion efficiency of 5.62% with a V OC of 0.93 V, J SC of 9.60 mA·cm−2, and a FF of 0.63.

Terminal group modification of alkylthio substituted small molecule donor materials for organic solar cells

2019 ◽  
Vol 171 ◽  
pp. 107653
Author(s):  
Yi Li ◽  
Yuancong Zhong ◽  
Shuguang Wen ◽  
Yong Zhang ◽  
Renqiang Yang
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Terminal Group ◽  
Group Modification

A thieno[3,4-b]pyrazine-based A2–A1–D–A1–A2 type low bandgap non-fullerene acceptor with 1,1-dicyanomethylene-3-indanone (IC) as the terminal group

2019 ◽  
Vol 7 (29) ◽  
pp. 8820-8824 ◽  
Author(s):  
Jianfeng Li ◽  
You Chen ◽  
Xiaochen Wang ◽  
Feng Li ◽  
Ailing Tang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Significant Role ◽  
Organic Solar Cells ◽  
Power Conversion ◽  
Terminal Group ◽  
Low Bandgap ◽  
Conversion Efficiencies

As the most successful end-capped unit in conventional A–D–A type non-fullerene acceptors (NFAs), 1,1-dicyanomethylene-3-indanone (IC) plays a significant role in enhancing the power conversion efficiencies (PCEs) of organic solar cells (OSCs).

Achieving high-performance non-halogenated nonfullerene acceptor-based organic solar cells with 13.7% efficiency via a synergistic strategy of an indacenodithieno[3,2-b]selenophene core unit and non-halogenated thiophene-based terminal group

2019 ◽  
Vol 7 (42) ◽  
pp. 24389-24399 ◽  
Author(s):  
Kai-Kai Liu ◽  
Xiaopeng Xu ◽  
Jin-Liang Wang ◽  
Chao Zhang ◽  
Gao-Yang Ge ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
High Performance ◽  
Terminal Group ◽  
Nonfullerene Acceptor

The combination of indacenodithieno[3,2-b]selenophene core unit and thiophene-containing IC is a successful synergistic strategy with PCE of 13.7%, which is the highest value in NFAs with thiophene-containing IC for binary OSCs.

scholarly journals Terminal group engineering for small-molecule donors boosts the performance of nonfullerene organic solar cells

2019 ◽  
Vol 7 (6) ◽  
pp. 2541-2546 ◽  
Author(s):  
Tainan Duan ◽  
Hua Tang ◽  
Ru-Ze Liang ◽  
Jie Lv ◽  
Zhipeng Kan ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Terminal Group ◽  
Fused Ring

Two new small molecule donors (BDT-RO and BDT-RN) with esterified rhodanine (RE) as the terminal group are designed and synthesized. By combining with the fused-ring acceptor IDIC, a high PCE of over 9.0% is achieved by BDT-RO, and its isomer BDT-RN also shows a PCE close to 8.4%.

scholarly journals Small-Molecule Donor/Polymer Acceptor Type Organic Solar Cells: Effect of Terminal Groups of Small-Molecule Donors

2019 ◽  
Vol 01 (01) ◽  
pp. 088-094 ◽  
Author(s):  
Junhui Miao ◽  
Bin Meng ◽  
Jun Liu ◽  
Lixiang Wang
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Power Conversion ◽  
Photovoltaic Performance ◽  
Terminal Group ◽  
Device Performance ◽  
The Core ◽  
Polymer Acceptor ◽  
The One

Small-molecule donor/polymer acceptor type (MD/PA-type) organic solar cells (OSCs) have the great advantage of superior thermal stability. However, very few small molecular donors can match polymer acceptors, leading to low power conversion efficiency (PCE) of MD/PA-type OSCs. In this work, we studied the effect of terminal groups of small molecular donors on the optoelectronic properties and OSC device performance of MD/PA-type OSCs. We select a benzodithiophene unit bearing carbazolyl substituents as the core, terthiophene as the bridging unit, and electron-withdrawing methyl 2-cyanoacetate, 3-ethylrhodanine, and 2H-indene-1,3-dione as the terminal groups to develop three small-molecule donors. With the increase of the electron-withdrawing capability of the terminal groups, the small molecular donors exhibit redshifted absorption spectra and downshifted LUMO levels. Among the three small-molecule donors, the one with 3-ethylrhodanine terminal group exhibits the best photovoltaic performance with the PCE of 8.0% in MD/PA-type OSCs. This work provides important guidelines for the design of small-molecule donors for MD/PA-type OSC applications.

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