|
|
| Type |
Poster Presentation |
| Area |
Physical Chemistry |
| Room No. |
Exhibition Hall 2+3 |
| Time |
10월 20일 (금요일) 13:00~14:30 |
| Code |
PHYS.P-82 |
| Subject |
Unveiling the Complexity of the Degradation Mechanism of Semiconducting Organic Polymers: Visible Light-Induced Oxidation of P3HT Films on ZnO/ITO under Atmospheric Conditions |
| Authors |
TaeGyun Woo, Hyun Ook Seo1, BYEONG JUN CHA, IL HEE KIM, Sangwook Han, Young Dok Kim*
Department of Chemistry, Sungkyunkwan University, Korea
1Department of Chemical Energy Engineering, Sangmyung University, Korea
|
| Abstract |
The oxidation of poly(3-hexylthiophene) (P3HT) films deposited on ZnO/ indium tin oxide (ITO) under blue light irradiation in either dry or humid atmosphere was studied using X-ray photoelectron spectroscopy in combination with UV-vis absorption spectroscopy. From results up to 12 h of reaction, ring-opening was hardly found and it is suggested that the water molecules chemisorbed competitively against O2 (i.e., the major oxidizing agent), thereby decreasing the oxidation of P3HT. Beyond 12 h, thiophene ring opening took place at the topmost surface layer of P3HT, and the water vapor facilitated the ring opening of P3HT. Considering the oxidation in the entire polymer film, the humidity did not perform significant role on the oxidation behavior of P3HT. Here, the degree of oxidation of P3HT drastically increased when the reaction time exceeded 12 h. This suggests that the rate of oxidation of the entire P3HT film is determined by the slow diffusion of the activated oxygen species which was the major oxidizing agent into the deeper layers of the P3HT films. We also demonstrate that the photoinduced degradation of P3HT can be retarded by turning off light between irradiation, which may be due to the reversible desorption of activated oxygen species under dark conditions. |
| E-mail |
tkwoo21@naver.com |
|
120th General Meeting of the KCS