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| Content Provider | Springer Nature Link |
|---|---|
| Author | Aziz, Shujahadeen B. |
| Copyright Year | 2015 |
| Abstract | An innovative method has been used to reduce the bandgap of poly(vinyl alcohol) (PVA) polymer by addition of a nontoxic, inexpensive, and environmentally friendly material. The resulting materials are small-bandgap polymers, hence opening new frontiers in green chemistry. The doped PVA films showed a wide range of light absorption of the solar spectrum from 200 nm to above 800 nm. Nonsharp absorption behavior versus wavelength was observed for the samples. The refractive index exhibited a wide range of dispersion. Shift of the absorption edge from 6.2 eV to 1.5 eV was observed. The energy bandgap of PVA was diminished to 1.85 eV upon addition of black tea extract solution, lying in the range of small-bandgap polymers. Increase of the optical dielectric constant was observed with increasing tea solution addition. The results indicate that small-bandgap PVA with good film-forming ability could be useful in terms of cost–performance tradeoff, solving problems of short lifetime, cost, and flexibility associated with conjugated polymers. The decrease of the Urbach energy upon addition of black tea extract solution indicates modification of PVA from a disordered to ordered material. X-ray diffraction results confirm an increase of the crystalline fraction in the doped samples. |
| Starting Page | 736 |
| Ending Page | 745 |
| Page Count | 10 |
| File Format | |
| ISSN | 03615235 |
| Journal | Journal of Electronic Materials |
| Volume Number | 45 |
| Issue Number | 1 |
| e-ISSN | 1543186X |
| Language | English |
| Publisher | Springer US |
| Publisher Date | 2015-11-19 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | PVA solid films black tea extract solution complex refractive index energy bandgap Urbach energy XRD analysis Optical and Electronic Materials Characterization and Evaluation of Materials Electronics and Microelectronics, Instrumentation Solid State Physics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Materials Chemistry Electronic, Optical and Magnetic Materials Condensed Matter Physics Electrical and Electronic Engineering |
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