Functionalized alkenyl side chains: a feasible strategy to improve charge transport and photovoltaic performance

2020 ◽  
Vol 8 (6) ◽  
pp. 2171-2177 ◽  
Author(s):  
Bing Zheng ◽  
Juan Liu ◽  
Xuexue Pan ◽  
Yu Zhang ◽  
Zaiyu Wang ◽  
...  
Keyword(s):  
Charge Transport ◽  
Effective Charge ◽  
Fill Factor ◽  
Photovoltaic Performance ◽  
Hole Mobility ◽  
Side Chains ◽  
Photovoltaic Devices ◽  
High Fill Factor

To pursue effective charge transport and high fill factor (FF) in photovoltaic devices, adopting ordered polymers with enhanced hole mobility is greatly desired.

Nanorods and Nanotubes for Solar Cells

2008 ◽  
Vol 8 (1) ◽  
pp. 131-148 ◽  
Author(s):  
V. V. Kislyuk ◽  
O. P. Dimitriev
Keyword(s):  
Carbon Nanotubes ◽  
Solar Cells ◽  
Charge Transport ◽  
Effective Charge ◽  
Photovoltaic Performance ◽  
Photovoltaic Cells ◽  
Photovoltaic Devices ◽  
Top Down ◽  
Advantages And Disadvantages ◽  
Photoactive Materials

Nanorods and nanotubes as photoactive materials as well as electrodes in photovoltaic cells have been launched a few years ago, and the literature in this field started to appear only recently. The first steps have shown both advantages and disadvantages of their application, and the main expectation associated with their effective charge transport has not been realized completely. This article aims to review both the first and the recent tendencies in the development and application of nanorod and nanotube materials in photovoltaic cells. Two basic techniques of synthesis of crystalline nanorod structures are described, the top-down and bottom-up approaches, respectively. Design and photovoltaic performance of solar cells based on various semiconductor nanorod materials, such as TiO2, ZnO, CdS, CdSe, CdTe, CuO, Si are presented and compared with respective solar cells based on semiconductor nanoparticles. Specific of synthesis and application of carbon nanotubes in photovoltaic devices is also reviewed.

Theoretical study of charge-transport and optical properties of indeno[1,2-b]fluorene-6,12-dione-based semiconducting materials

2018 ◽  
Vol 74 (6) ◽  
pp. 705-711 ◽  
Author(s):  
Jin-Dou Huang ◽  
Jinfeng Zhao ◽  
Kun Yu ◽  
Xiaohua Huang ◽  
Shi-Bo Cheng ◽  
...  
Keyword(s):  
Optical Properties ◽  
Charge Transport ◽  
Near Infrared ◽  
Reorganization Energy ◽  
Hole Mobility ◽  
Side Chains ◽  
Semiconducting Materials ◽  
Π Stacking ◽  
Electron Transfer Theory ◽  
Reorganization Energies

The conducting and optical properties of a series of indeno[1,2-b]fluorene-6,12-dione (IFD)-based molecules have been systematically studied and the influences of butyl, butylthio and dibutylamino substituents on the reorganization energies, intermolecular electronic couplings and charge-injection barriers of IFD have been discussed. The quantum-chemical calculations combined with electron-transfer theory reveal that the incorporation of sulfur-linked side chains decreases reorganization energy associated with hole transfer and optimizes intermolecular π–π stacking, which results in excellent ambipolar charge-transport properties (μh = 1.15 cm2 V−1 s−1 and μe = 0.08 cm2 V−1 s−1); in comparison, addition of dibutylamino side chains increases intermolecular steric interactions and hinders perfect intermolecular π–π stacking, which results in the weak electronic couplings and finally causes the low intrinsic hole mobility (μh = 0.01 cm2 V−1 s−1). Furthermore, electronic spectra of butyl-IFD, butylthio-IFD and dibutylamino-IFD were simulated and compared with the reported experimental data. Calculations demonstrate that IFD-based molecules possess potential for developing novel infrared and near-infrared probe materials via suitable chemical modifications.

scholarly journals Synthesis and Photovoltaic Effect of Electron-Withdrawing Units for Low Band Gap Conjugated Polymers Bearing Bi(thienylenevinylene) Side Chains

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1461 ◽  
Author(s):  
Jianfeng Li ◽  
Yufei Wang ◽  
Ningning Wang ◽  
Zezhou Liang ◽  
Xu Wang ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Open Circuit Voltage ◽  
Photovoltaic Effect ◽  
Photovoltaic Performance ◽  
Hole Mobility ◽  
Open Circuit ◽  
Photovoltaic Devices ◽  
Good Thermal Stability ◽  
Highest Occupied Molecular Orbital ◽  
Donor Acceptor

A novel (E)-5-(2-(5-alkylthiothiophen-2-yl)vinyl)thien-2-yl (TVT)-comprising benzo[1,2-b:4,5-b’]dithiophene (BDT) derivative (BDT-TVT) was designed and synthetized to compose two donor-acceptor (D-A) typed copolymers (PBDT-TVT-ID and PBDT-TVT-DTNT) with the electron-withdrawing unit isoindigo (ID) and naphtho[1,2-c:5,6-c′]bis[1,2,5]thiadiazole (NT), respectively. PBDT-TVT-ID and PBDT-TVT-DTNT showed good thermal stability (360 °C), an absorption spectrum from 300 nm to 760 nm and a relatively low lying energy level of Highest Occupied Molecular Orbital (EHOMO) (−5.36 to –5.45 eV), which could obtain a large open-circuit voltage (Voc) from photovoltaic devices with PBDT-TVT-ID or PBDT-TVT-DTNT. The photovoltaic devices with ITO/PFN/polymers: PC71BM/MoO3/Ag structure were assembled and exhibited a good photovoltaic performance with a power conversion efficiency (PCE) of 4.09% (PBDT-TVT-ID) and 5.44% (PBDT-TVT-DTNT), respectively. The best PCE of a PBDT-TVT-DTNT/PC71BM-based device mainly originated from its wider absorption, higher hole mobility and favorable photoactive layer morphology.

scholarly journals Steady Enhancement in Photovoltaic Properties of Fluorine Functionalized Quinoxaline-Based Narrow Bandgap Polymer

Molecules ◽  
2018 ◽  
Vol 24 (1) ◽  
pp. 54 ◽  
Author(s):  
Zhonglian Wu ◽  
Huanxiang Jiang ◽  
Xingzhu Wang ◽  
Lei Yan ◽  
Wei Zeng ◽  
...  
Keyword(s):  
Fill Factor ◽  
Polymer Solar Cells ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Hole Mobility ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Promising Candidate ◽  
Photovoltaic Properties ◽  
Narrow Bandgap

To investigate the influence of fluoride phenyl side-chains onto a quinoxaline (Qx) unit on the photovoltaic performance of the narrow bandgap (NBG) photovoltaic polymers, herein, two novel NBG copolymers, PBDTT-DTQx and PBDTT-DTmFQx, were synthesized and characterized. 2-ethylhexylthiothiophene-substituted benzodithiophene (BDTT), 2,3-diphenylquinoxaline (DQx) [or 2,3-bis(3-fluorophenyl)quinoxaline (DmFQx)] and 2-ethylhexylthiophene (T) were used as the electron donor (D) unit, electron-withdrawing acceptor (A) unit and π-bridge, respectively. Compared to non-fluorine substituted PBDTT-DTQx, fluoride PBDTT-DTmFQx exhibited a wide UV-Vis absorption spectrum and high hole mobility. An enhanced short-circuit current (Jsc) and fill factor (FF) simultaneously gave rise to favorable efficiencies in the polymer/PC71BM-based polymer solar cells (PSCs). Under the illumination of AM 1.5G (100 mW cm−2), a maximum power conversion efficiency (PCE) of 6.40% was achieved with an open-circuit voltage (Voc) of 0.87 V, a Jsc of 12.0 mA cm−2 and a FF of 61.45% in PBDTT-DTmFQx/PC71BM-based PSCs, while PBDTT-DTQx-based devices also exhibited a PCE of 5.43%. The excellent results obtained demonstrate that PBDTT-DTmFQx by fluorine atom engineering could be a promising candidate for organic photovoltaics.

A methylammonium iodide healing method for CH3NH3PbI3 perovskite solar cells with high fill factor over 80%

2021 ◽  
Vol 42 (11) ◽  
pp. 112202
Author(s):  
Zhen Li ◽  
Guanjun Yang
Keyword(s):  
Heat Treatment ◽  
Thermal Decomposition ◽  
Solar Cells ◽  
Fill Factor ◽  
Power Conversion ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Photoluminescence Intensity ◽  
High Quality ◽  
High Fill Factor

Abstract Repressing the thermal decomposition during the process of heat treatment plays an indispensable part in the preparation of perovskite films. Here, a methylammonium iodide healing method was applied to prevent the volatilization of the organic component inside the perovskite structure during the heat treatment. High-quality CH3NH3PbI3 film with a much larger grain size over 800 nm was successfully fabricated via this healing method. Besides, the absorption and photoluminescence intensity were also both improved. Finally, the best power conversion efficiency of 18.89% with a fill factor over 80% was realized in an n–i–p configuration while possessing outstanding stability. This work suggests that methylammonium iodide healing method is a reliable way to promote crystal growth and improve the photovoltaic performance and humidity stability of the CH3NH3PbI3 solar cells.

Significantly enhanced electron transport of a nonfullerene acceptor in a blend film with a high hole mobility polymer of high molecular weight: thick-film nonfullerene polymer solar cells showing a high fill factor

2020 ◽  
Vol 8 (16) ◽  
pp. 7765-7774 ◽  
Author(s):  
Zhen Wang ◽  
Haiying Jiang ◽  
Xuncheng Liu ◽  
Jiahao Liang ◽  
Lianjie Zhang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Solar Cells ◽  
Electron Transport ◽  
High Molecular Weight ◽  
Electron Mobility ◽  
Fill Factor ◽  
Polymer Solar Cells ◽  
Hole Mobility ◽  
High Fill Factor ◽  
Nonfullerene Acceptor

Higher electron mobility was achieved with a high hole mobility polymer based nonfullerene active layer.

Comparative studies on photovoltaic performance of InN nanostructures/p-Si(100) heterojunction devices grown by molecular beam epitaxy

2012 ◽  
Vol 1391 ◽  
Author(s):  
Thirumaleshwara N Bhat ◽  
Mohana K Rajpalke ◽  
Mahesh Kumar ◽  
Basanta Roul ◽  
S B Krupanidhi
Keyword(s):  
Molecular Beam Epitaxy ◽  
Comparative Studies ◽  
Molecular Beam ◽  
Fill Factor ◽  
Photovoltaic Performance ◽  
Superior Performance ◽  
Photovoltaic Devices ◽  
Junction Area ◽  
Single Junction ◽  
Junction Property

ABSTRACTComparative studies have been carried out on the performance of the photovoltaic devices with dissimilar shapes of the InN nanostructures fabricated on p-Si (100). The devices fabricated with the nanodots show a superior performance compared to the devices fabricated with the nanorods. The discussions have been carried out on the superior junction property, larger effective junction area and inherent random pyramidal topographical texture of the cell fabricated with nanodots. Such single junction devices exhibit a promising fill factor and external quantum efficiency of 38% and 27%, respectively, under concentrated AM1.5 illumination.

Inhibition of In‐Plane Charge Transport in Hole Transfer Layer to Achieve High Fill Factor for Inverted Planar Perovskite Solar Cells

Solar RRL ◽  
2019 ◽  
Vol 3 (7) ◽  
pp. 1900104 ◽  
Author(s):  
Lijun Hu ◽  
Jiehao Fu ◽  
Ke Yang ◽  
Zhuang Xiong ◽  
Ming Wang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transport ◽  
Fill Factor ◽  
Perovskite Solar Cells ◽  
Transfer Layer ◽  
Hole Transfer ◽  
High Fill Factor
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