Low Band-Gap Materials for Solar Cells

Materials for Solar Cell Technologies I - Materials Research Foundations ◽

10.21741/9781644901090-7 ◽

2021 ◽

pp. 176-235

Keyword(s):

Solar Cells ◽

Band Gap ◽

Organic Solar Cells ◽

Charge Separation ◽

Chemical Properties ◽

Low Energy ◽

Practical Applications ◽

Film Forming ◽

Donor And Acceptor ◽

Induced Charge

Organic solar cells (OSCs) are discussed at length in terms of its performance leading to the generation of electricity. The key materials required for OSCs are the small organic molecules having donor and acceptor with suitable light absorption and electro-chemical properties of low energy band gap. Various structural scaffolds are highlighted with their structural design leading to film forming in an orderly manner and this morphology of film having a pivotal role in photo-induced charge separation, migration and collection at an electrode. Present day research informs that OSCs involving non fullerene based donors and acceptors are functioning with high photo conversion efficiency [PCE] of >17% and are promising candidates for practical applications.

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Low-Band-Gap Small Molecule for Efficient Organic Solar Cells with a Low Energy Loss below 0.6 eV and a High Open-Circuit Voltage of over 0.9 V

ACS Energy Letters ◽

10.1021/acsenergylett.7b00608 ◽

2017 ◽

Vol 2 (9) ◽

pp. 2021-2025 ◽

Cited By ~ 45

Author(s):

Daobin Yang ◽

Hisahiro Sasabe ◽

Takeshi Sano ◽

Junji Kido

Keyword(s):

Solar Cells ◽

Energy Loss ◽

Band Gap ◽

Small Molecule ◽

Organic Solar Cells ◽

Open Circuit Voltage ◽

Open Circuit ◽

Low Energy ◽

Low Band Gap

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Effects of end-on oriented polymer chains at the donor/acceptor interface in organic solar cells

Journal of Materials Chemistry A ◽

10.1039/c8ta09307e ◽

2018 ◽

Vol 6 (45) ◽

pp. 22889-22898 ◽

Cited By ~ 11

Author(s):

Fanji Wang ◽

Kyohei Nakano ◽

Hiroyuki Yoshida ◽

Kazuhito Hashimoto ◽

Hiroshi Segawa ◽

...

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Charge Separation ◽

Polymer Chains ◽

Oriented Polymer ◽

Coulombic Interaction ◽

Donor And Acceptor ◽

Donor Acceptor

Intrachain hole delocalization vertical to donor and acceptor interface weakens coulombic interaction of the charge pairs and facilitate the charge separation in organic solar cells.

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Computational Designing of Low Energy Gap Small Molecule Acceptors for Organic Solar Cells

Journal of the Mexican Chemical Society ◽

10.29356/jmcs.v61i4.461 ◽

2018 ◽

Vol 61 (4) ◽

Author(s):

Ahmad Irfan ◽

Asif Mahmood

Keyword(s):

Optical Properties ◽

Solar Cells ◽

Band Gap ◽

Small Molecule ◽

Organic Solar Cells ◽

Organic Solar Cell ◽

Energy Gap ◽

Energy Levels ◽

Low Energy ◽

Homo Lumo

In this study, effort is done to design a series of narrowband-gap small molecule acceptors for organic solar cells. We have predicated the electronic and optical properties using theoretical methods. Results show that the orbital spatial distribution, HOMO/LUMO energy levels, band gap and optical properties can be systematically changedby modification of terminal acceptor units and conjugated system. Most of the acceptors show low energy gaps reveal thermodynamical more stability. Conjugated system help to tune the electronic properties and decrease the band gap of small molecules. Finally, we have identified potential terminal acceptor groups for proficient organic solar cell materials.

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Photophysical Properties of the PVK-MEH-PPV/PCBM Composite for Organic Solar Cells Application: Synthesis, Characterization and Computational Study

Polymers ◽

10.3390/polym13172902 ◽

2021 ◽

Vol 13 (17) ◽

pp. 2902

Author(s):

Faten Abbassi ◽

Mohamed Mbarek ◽

Maha Almoneef ◽

Kamel Alimi

Keyword(s):

Solar Cells ◽

Charge Transfer ◽

Organic Solar Cells ◽

Density Functional ◽

Computational Study ◽

Photophysical Properties ◽

Chemical Properties ◽

Acid Methyl Ester ◽

Time Resolved ◽

Donor And Acceptor

The physical and chemical properties of a new organic composite including PVK-MEH-PPV bi-block copolymer and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were recorded. The functionalization and the charge transfer that occurs between donor and acceptor were examined and computed. In fact, the stationary and time-resolved photoluminescence properties were used to examine the effect of the PCBM on the optical properties of the PVK-MEH-PPV matrix. The photoluminescence quenching accompanied by faster PL decay confirmed the charge transfer and interaction process. The electrical and optoelectronic properties and the charge carriers’ injection in the resulting composite were examined. The experimental conclusion was corroborated and confirmed by a calculation based on density functional theory (DFT). Hence, the combination of experimental and theoretical results indicated that the result composite can be applied as an active layer for organic solar cells.

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Recent Advances of Film–Forming Kinetics in Organic Solar Cells

Energies ◽

10.3390/en14227604 ◽

2021 ◽

Vol 14 (22) ◽

pp. 7604

Author(s):

Qiuju Liang ◽

Jianhong Yao ◽

Zhangbo Hu ◽

Puxin Wei ◽

Haodong Lu ◽

...

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Low Cost ◽

Device Performance ◽

Film Morphology ◽

Forming Process ◽

Crystallinity Degree ◽

Film Forming ◽

Donor And Acceptor ◽

Conversion Efficiencies

Solution–processed organic solar cells (OSC) have been explored widely due to their low cost and convenience, and impressive power conversion efficiencies (PCEs) which have surpassed 18%. In particular, the optimization of film morphology, including the phase separation structure and crystallinity degree of donor and acceptor domains, is crucially important to the improvement in PCE. Considering that the film morphology optimization of many blends can be achieved by regulating the film–forming process, it is necessary to take note of the employment of solvents and additives used during film processing, as well as the film–forming conditions. Herein, we summarize the recent investigations about thin films and expect to give some guidance for its prospective progress. The different film morphologies are discussed in detail to reveal the relationship between the morphology and device performance. Then, the principle of morphology regulating is concluded with. Finally, a future controlling of the film morphology and development is briefly outlined, which may provide some guidance for further optimizing the device performance.

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