Improvement of open-circuit voltage and photovoltaic properties of 2D-conjugated polymers by alkylthio substitution

2014 ◽  
Vol 7 (7) ◽  
pp. 2276-2284 ◽  
Author(s):  
Chaohua Cui ◽  
Wai-Yeung Wong ◽  
Yongfang Li
Keyword(s):  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Side Chain ◽  
Photovoltaic Properties ◽  
Conjugated Copolymer

The photovoltaic properties of 2D-conjugated copolymer PBDTTTs were further improved by side chain engineering in a 2D-conjugated polymer.

scholarly journals Effect of main and side chain chlorination on the photovoltaic properties of benzodithiophene-alt-benzotriazole polymers

2020 ◽  
Vol 8 (43) ◽  
pp. 15426-15435
Author(s):  
Haijun Bin ◽  
Indunil Angunawela ◽  
Ruijie Ma ◽  
Asritha Nallapaneni ◽  
Chenhui Zhu ◽  
...  
Keyword(s):  
Energy Level ◽  
Charge Transport ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Open Circuit Voltage ◽  
Power Conversion ◽  
Open Circuit ◽  
Side Chain ◽  
Photovoltaic Properties ◽  
Homo Energy Level

Introduction of chlorine in the conjugated side chains significantly improves open-circuit voltage and power conversion efficiency, benefiting from a lower HOMO energy level, well-balanced charge transport and superior nanoscale morphology.

scholarly journals Synthesis of Bithiophene-Based D-A1-D-A2 Terpolymers with Different A2 Moieties for Polymer Solar Cells via Direct Arylation

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 55 ◽  
Author(s):  
Jinfeng Huang ◽  
Zhenkun Lin ◽  
Wenhuai Feng ◽  
Wen Wang
Keyword(s):  
Open Circuit Voltage ◽  
Polymer Solar Cells ◽  
Energy Levels ◽  
Open Circuit ◽  
Side Chain ◽  
Film Morphology ◽  
Photovoltaic Properties ◽  
Direct Arylation ◽  
Blend Film ◽  
Highest Occupied Molecular Orbital

A series of bithiophene (2T)-based D-A1-D-A2 terpolymers with different A2 moieties were prepared via direct arylation reaction. In these terpolymers, pyrrolo[3,4-c]pyrrole-1,4-dione (DPP) was selected as the first electron-accepting (A1) moiety, 2,1,3-benzothiadiazole (BT) or fluorinated benzothiadiazole (FBT) or octyl-thieno[3,4-c]pyrrole-4,6-dione (TPD) or 2,1,3-benzoselendiazole (SeT) was selected as the second electron-accepting (A2) moiety, while bithiophene with hexyl side chain was used as the electron-donating moiety. The UV-vis absorption, electrochemical properties, blend film morphology, and photovoltaic properties were studied to explore the effects of the A2 moiety. It is shown that these terpolymer films exhibit broad absorption (350–1000 nm), full width at half-maximum of more than 265 nm and ordered molecular packing. Varying the A2 moiety could affect the energy levels and blend film morphology leading to different polymer solar cell (PSC) performances of these (2T)-based D-A1-D-A2 terpolymers. As a result, the highest Jsc of 10.70 mA/cm2 is achieved for Polymer 1 (P1) with BT as A2 moiety, while the higher highest occupied molecular orbital (HOMO) level limits the open circuit voltage (Voc) and leads to a power conversion efficiency (PCE) of 3.46%.

The Side-Chain Effects on Photovoltaic Properties of Copolymers Based on Phenothiazine and Thiophene

2013 ◽  
Vol 634-638 ◽  
pp. 2621-2628 ◽  
Author(s):  
Han Sol Yoo ◽  
Dae Hee Yun ◽  
Tae Won Ko ◽  
Yong Sung Park ◽  
Je Wan Woo
Keyword(s):  
Fill Factor ◽  
Optical Band Gap ◽  
Open Circuit Voltage ◽  
Short Circuit ◽  
Coupling Reaction ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Side Chain ◽  
Photovoltaic Properties ◽  
Suzuki Coupling Reaction

In this study, the alternating conductive polymers based on phenothiazine and bithiophene unit, poly[(N-10-dodecyl-phenothiazin-3,7-ylene)-alt-(2,2’-bithiophen-5-yl)] (P1) and poly[(N-10- dodecyl-phenothiazin-3,7-ylene)-alt-(4,4’-didodecyl-2,2’-bithiophen-5-yl)] (P2), were synthesized by Suzuki coupling reaction in the presence of palladium catalyst. The structures of synthesized compounds were confirmed by 1H NMR. The optical, electrochemical properties of synthesized polymers were investigated by UV-Vis, cyclic voltammetry (CV). The optical band gap of 2.22 eV and 2.50 eV was obtained from absorption onset of UV-Vis spectrum. Then, the two devices using blends of the polymer, as a donor, and PC71BM, as an acceptor, were fabricated by spin-coating. The device with a P1:PC71BM (1:4, w/w) as an active layer exhibited the best performance with an open circuit voltage (VOC) of 0.68 V, short circuit current (JSC) of 3.5 mA/cm2, fill factor (FF) of 31.8 % and power conversion efficiency (PCE) of 0.74 %.

Synthesis and Photovoltaic Properties of Fluorene-Based Copolymers with Thiophene Heterocycle on the Side Chain

2011 ◽  
Vol 383-390 ◽  
pp. 7677-7681
Author(s):  
Qiong Hou ◽  
Xiang Hua Zeng ◽  
Xin Xu ◽  
Ting Guo ◽  
Hong Yu Zhen ◽  
...  
Keyword(s):  
Band Gap ◽  
Open Circuit Voltage ◽  
Narrow Band ◽  
Power Conversion ◽  
Open Circuit ◽  
Side Chain ◽  
Photovoltaic Properties ◽  
Coupling Methods ◽  
Electrode Interface ◽  
Hetero Cycle

High molecular weight, readily soluable copolymer was prepared from 9,9-di (2-thienyl-hexyl) fluorene (TF) 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9-di octyl fluorene and narrow band gap comonomer 2,3-dimethyl- 5,8-(5-bromo)-dithien-2-yl-quinoxalines (DTQU) using pallad- ium catalyzed Suzuki coupling methods. To compare the copolymer to this without thiophene in the C9 side chain of fluorene, the copolymer from DOF and DTQU was synthesized. The electrochemical, optical and photovoltaic properties of the copolymers were studied. The absorption spectra of the copolymers measured in thin films display two absorption peaks. The power conversion efficiency achieved in the device configuration ITO/PEDT/FT- DTQU:PCBM (1:2)/Al is 0.85% with open-circuit voltage (Voc) 0.8V. Further improvement by manipulating polymer/electrode interface and further investigation of more polyfluorene copolymers with narrow band gap aryl-hetero cycle units on the side chain is in progress.

Synthesis and Photovoltaic Properties of Fluorene-Based Copolymers

2010 ◽  
Vol 150-151 ◽  
pp. 340-343
Author(s):  
Qiong Hou ◽  
Xiang Hua Zeng ◽  
Hong Yu Zhen ◽  
Guo Long Li ◽  
Ting Guo ◽  
...  
Keyword(s):  
Thin Films ◽  
Power Conversion Efficiency ◽  
Open Circuit Voltage ◽  
Narrow Band ◽  
Power Conversion ◽  
Open Circuit ◽  
Side Chain ◽  
Coupling Reactions ◽  
Photovoltaic Properties ◽  
Hetero Cycle

A serial of polyfluorene copolymers have been developed by covalently attaching thiophene units to the side chain of polyfluorene with an alkyl spacer by means of Pd-catalyzed Suzuki coupling reactions. The electrochemical, photophysical and photovoltaic properties of the copolymers were studied. The absorption spectra of the copolymers measured in thin films display two absorption peaks. The power conversion efficiency achieved in the device configuration ITO/PEDT/ PFO-FT-DBT: PCBM (1:2)/Al is 0.83% with open-circuit voltage (Voc) 0.75V. Further investigation of more polyfluorene copolymers with narrow band gap aryl-hetero cycle units on the side chain is in progress.

Photovoltaic Properties of a Conjugated Copolymer Blending with Flame-Made ZnO Nanoparticles

2017 ◽  
Vol 866 ◽  
pp. 350-353
Author(s):  
Viruntachar Kruefu ◽  
Chanitpa Khantha ◽  
Jatuphorn Wootthikanokkhan ◽  
Sukon Phanichphant
Keyword(s):  
Solar Cells ◽  
Zno Nanoparticles ◽  
Open Circuit Voltage ◽  
Bulk Heterojunction ◽  
Acid Methyl Ester ◽  
Open Circuit ◽  
Flame Spray ◽  
Photovoltaic Properties ◽  
Solvent Additive ◽  
Conjugated Copolymer

The synthesis, characterizations, and photovoltaic studies of copolymer based on 4,4-dodecylpentaleno[1,2-b]dithiophene (PC12PDT) and 5-octyl-5H-thieno[3,4-c]pyrrole-4,6-dione (TPD) were described. The PC12PDTTPD copolymer achieved a high open circuit voltage (Voc) of ~ 0.8-0.9 V. Bulk-heterojunction (BHJ) solar cells were fabricated by using chlorobenzene with 1% chloronapthalene as the solvent additive. The ZnO nanoparticles, produced by flame spray pyrolysis (FSP), were dispersed in 1-butanol. After that, it was loaded into the devices along with [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) used as the electron acceptor. From the results, it was found that the ZnO nanoparticles with different amount had the effect on the power conversion efficiency (PCE) of the solar cells. The PCE obtained in this study (3.33%) was found in the 5.45 wt% ZnO loaded device. This was an improvement as compared to that of the standard device (2.45%).

Bulky electron donating side chain enhances the open-circuit voltage of benzodithiophene photovoltaic polymers

2020 ◽  
Vol 18 ◽  
pp. 100568
Author(s):  
Mingqun Yang ◽  
Wen Cui ◽  
Xin Song ◽  
Yong Zhao ◽  
Xin Jing ◽  
...  
Keyword(s):  
Open Circuit Voltage ◽  
Open Circuit ◽  
Side Chain

scholarly journals Direct AFM-based nanoscale mapping and tomography of open-circuit voltages for photovoltaics

2018 ◽  
Vol 9 ◽  
pp. 1802-1808 ◽  
Author(s):  
Katherine Atamanuk ◽  
Justin Luria ◽  
Bryan D Huey
Keyword(s):  
Solar Cells ◽  
Open Circuit Voltage ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Three Dimensional ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Photovoltaic Properties ◽  
Order Of Magnitude ◽  
Individual Grains

The nanoscale optoelectronic properties of materials can be especially important for polycrystalline photovoltaics including many sensor and solar cell designs. For thin film solar cells such as CdTe, the open-circuit voltage and short-circuit current are especially critical performance indicators, often varying between and even within individual grains. A new method for directly mapping the open-circuit voltage leverages photo-conducting AFM, along with an additional proportional-integral-derivative feedback loop configured to maintain open-circuit conditions while scanning. Alternating with short-circuit current mapping efficiently provides complementary insight into the highly microstructurally sensitive local and ensemble photovoltaic performance. Furthermore, direct open-circuit voltage mapping is compatible with tomographic AFM, which additionally leverages gradual nanoscale milling by the AFM probe essentially for serial sectioning. The two-dimensional and three-dimensional results for CdTe solar cells during in situ illumination reveal local to mesoscale contributions to PV performance based on the order of magnitude variations in photovoltaic properties with distinct grains, at grain boundaries, and for sub-granular planar defects.

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