Effective Passivation of Nanostructured TiO2 Interfaces with PEG-Based Oligomeric Coadsorbents To Improve the Performance of Dye-Sensitized Solar Cells
- Authors
- Lee, Yong-Gun; Park, Suil; Cho, Woohyung; Son, Taewook; Sudhagar, P.; Jung, June Hyuk; Wooh, Sanghyuk; Char, Kookheon; Kang, Yong Soo
- Issue Date
- Mar-2012
- Publisher
- AMER CHEMICAL SOC
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY C, v.116, no.11, pp 6770 - 6777
- Pages
- 8
- Journal Title
- JOURNAL OF PHYSICAL CHEMISTRY C
- Volume
- 116
- Number
- 11
- Start Page
- 6770
- End Page
- 6777
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/48842
- DOI
- 10.1021/jp210360n
- ISSN
- 1932-7447
1932-7455
- Abstract
- A novel poly(ethylene glycol) (PEG) based oligomeric coadsorbent was employed to passivate TiO2 photoanodes resulting in the large increase in both open-circuit voltage (Voc) and short-circuit current density (J(sc)) primarily because of the reduced electron recombination by the effective coverage of vacant sites as well as the negative band-edge shift of TiO2. The effective suppression of electron recombination was evidenced by electrochemical impedance spectroscopy (EIS) and by stepped light-induced transient measurements of photocurrent and voltage (SLIM-PCV). The work function measurements also showed that the existence of coadsorbents on TiO2 interfaces is capable of shifting the band-edge of TiO2 photoanodes upwardly resulting in the increase in photovoltage. In addition, the coadsorbent was proven to be effective even in the presence of common additives such as UT, 4-tert-butylpyridine, and guanidinium thiocyanate. The effect of Li+ cation trapping by ethylene oxide units of the coadsorbent was particularly notable to significantly increase V-oc at a small expense of J(sc). Consequently, the introduction of novel PEG-based oligomeric coadsorbents for TiO2 photoanodes is quite effective in the improvement of photovoltaic performance because of the simultaneous increase in both V-oc and L-sc.
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Collections - College of Engineering > School of Chemical Engineering and Material Science > 1. Journal Articles
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