Control in Energy Levels of Conjugated Polymers for Photovoltaic Application

2008 ◽  
Vol 112 (21) ◽  
pp. 7866-7871 ◽  
Author(s):  
Yongye Liang ◽  
Shengqiang Xiao ◽  
Danqin Feng ◽  
Luping Yu
Keyword(s):  
Conjugated Polymers ◽  
Energy Levels ◽  
Photovoltaic Application

Effect of fluorination and symmetry on the properties of polymeric photovoltaic materials based on an asymmetric building block

RSC Advances ◽  
2016 ◽  
Vol 6 (93) ◽  
pp. 90051-90060 ◽  
Author(s):  
Xiaochen Wang ◽  
Ailing Tang ◽  
Yu Chen ◽  
Asif Mahmood ◽  
Jianhui Hou ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Building Block ◽  
Energy Levels ◽  
Building Blocks ◽  
Asymmetric Building ◽  
Photovoltaic Materials

Introducing fluorine on benzothiadiazole unit significantly influenced the properties of DTPa and BTs based conjugated polymers by tuning the energy levels and symmetry of the building blocks.

scholarly journals Synthesis of Cyano-Substituted Conjugated Polymers for Photovoltaic Applications

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 746 ◽  
Author(s):  
Mun Ho Yang ◽  
Ho Cheol Jin ◽  
Joo Hyun Kim ◽  
Dong Wook Chang
Keyword(s):  
Conjugated Polymers ◽  
Molecular Orbital ◽  
Polymer Solar Cells ◽  
Short Circuit ◽  
Energy Levels ◽  
Coupling Reaction ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Strong Electron ◽  
Photovoltaic Properties

Three conjugated polymers, in which the electron-donating (D) 5-alkylthiophene-2-yl-substitued benzodithiophene was linked to three different electron-accepting (A) moieties, i.e., benzothiadiazole (BT), diphenylquinoxaline (DPQ), and dibenzophenazine (DBP) derivative via thiophene bridge, were synthesized using the Stille coupling reaction. In particular, the strong electron-withdrawing cyano (CN) group was incorporated into the A units BT, DPQ, and DBP to afford three D–A type target polymers PB–BTCN, PB–DPQCN, and PB–DBPCN, respectively. Owing to the significant contribution of the CN-substituent, these polymers exhibit not only low-lying energy levels of both the highest occupied molecular orbital and the lowest unoccupied molecular orbital, but also reduced bandgaps. Furthermore, to investigate the photovoltaic properties of polymers, inverted-type devices with the structure of ITO/ZnO/Polymer:PC71BM/MoO3/Ag were fabricated and analyzed. All the polymer solar cells based on the three cyano-substituted conjugated polymers showed high open-circuit voltages (Voc) greater than 0.89 V, and the highest power conversion efficiency of 4.59% was obtained from the device based on PB-BtCN with a Voc of 0.93 V, short-circuit current of 7.36 mA cm−2, and fill factor of 67.1%.

Intrinsic Surface Dipoles Control the Energy Levels of Conjugated Polymers

2009 ◽  
Vol 19 (24) ◽  
pp. 3874-3879 ◽  
Author(s):  
Georg Heimel ◽  
Ingo Salzmann ◽  
Steffen Duhm ◽  
Jürgen P. Rabe ◽  
Norbert Koch
Keyword(s):  
Conjugated Polymers ◽  
Energy Levels

N-Type Self-Doped Water/Alcohol-Soluble Conjugated Polymers with Tailored Energy Levels for High-Performance Polymer Solar Cells

2018 ◽  
Vol 51 (6) ◽  
pp. 2195-2202 ◽  
Author(s):  
Jianchao Jia ◽  
Baobing Fan ◽  
Manjun Xiao ◽  
Tao Jia ◽  
Yaocheng Jin ◽  
...  
Keyword(s):  
Solar Cells ◽  
Conjugated Polymers ◽  
High Performance ◽  
Polymer Solar Cells ◽  
Energy Levels ◽  
High Performance Polymer ◽  
Water Alcohol

PbSe nanocrystal/conducting polymer solar cells with an infrared response to 2 micron

2007 ◽  
Vol 22 (8) ◽  
pp. 2204-2210 ◽  
Author(s):  
Xiaomei Jiang ◽  
Richard D. Schaller ◽  
Sergey B. Lee ◽  
Jeffrey M. Pietryga ◽  
Victor I. Klimov ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Reverse Bias ◽  
Polymer Solar Cells ◽  
Energy Levels ◽  
Phenylene Vinylene ◽  
Type Ii ◽  
Photovoltaic Response ◽  
Carrier Multiplication ◽  
Regioregular Poly ◽  
Potential Benefits

We investigated the photovoltaic response of nanocomposites made of colloidal, infrared-sensitive, PbSe nanocrystals (NCs) of various sizes and conjugated polymers of either regioregular poly (3-hexylthiophene) (RR-P3HT) or poly- (2-methoxy-5-(2-ethylhexoxy)-1,4-phenylene vinylene) (MEH-PPV). The conduction and valence energy levels of PbSe NCs were determined by cyclic voltammetry and revealed type II heterojunction alignment with respect to energy levels in RR-P3HT for smaller NC sizes. Devices composed of NCs and RR-P3HT show good diode characteristics and sizable photovoltaic response in a spectral range from the ultraviolet to the infrared. Using these materials, we have observed photovoltaic response at wavelengths as far to the infrared as 2 μm (0.6 eV), which is desirable due to potential benefits of carrier multiplication (or multi-exciton generation) from a single junction photovoltaic. Under reverse bias, the devices also exhibit good photodiode responses over the same spectral region.

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