https://scholars.lib.ntu.edu.tw/handle/123456789/367592
Title: | Correlating interface heterostructure, charge recombination, and device efficiency of poly(3-hexyl thiophene)/TiO 2 nanorod solar cell | Authors: | Zeng, Tsung-Wei Ho, Chun-Chih Tu, Yu-Chieh Tu, Guan-Yao Wang, Lee-Yih Su, Wei-Fang WEI-FANG SU LEE-YIH WANG |
Issue Date: | 2011 | Publisher: | American Chemical Society | Journal Volume: | 27 | Journal Issue: | 24 | Start page/Pages: | 15255-15260 | Source: | Langmuir | Abstract: | The charge recombination rate in poly(3-hexyl thiophene)/TiO 2 nanorod solar cells is demonstrated to correlate to the morphology of the bulk heterojunction (BHJ) and the interfacial properties between poly(3-hexyl thiophene) (P3HT) and TiO 2. The recombination resistance is obtained in P3HT/TiO 2 nanorod devices by impedance spectroscopy. Surface morphology and phase separation of the bulk heterojunction are characterized by atomic force microscopy (AFM). The surface charge of bulk heterojunction is investigated by Kelvin probe force microscopy (KPFM). Lower charge recombination rate and lifetime have been observed for the charge carriers in appropriate heterostructures of hybrid P3HT/TiO 2 nanorod processed via high boiling point solvent and made of high molecular weight P3HT. Additionally, through surface modification on TiO 2 nan,orod, decreased recombination rate and longer charge carrier lifetime are obtained owing to creation of a barrier between the donor phases (P3HT) and the acceptor phases (TiO 2). The effect of the film morphology of hybrid and interfacial properties on charge carrier recombination finally leads to different outcome of photovoltaic I-V characteristics. The BHJ fabricated from dye-modified TiO 2 blended with P3HT exhibits 2.6 times increase in power conversion efficiency due to the decrease of recombination rate by almost 2 orders of magnitude as compared with the BHJ made with unmodified TiO 2. In addition, the interface heterostructure, charge lifetime, and device efficiency of P3HT/TiO 2 nanorod solar cells are correlated. © 2011 American Chemical Society. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-83455178125&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/367592 |
ISSN: | 07437463 | DOI: | 10.1021/la203533u | SDG/Keyword: | Bulk heterojunction; Charge carrier recombination; Charge recombinations; Device efficiency; Film morphology; High molecular weight; Impedance spectroscopy; Interfacial property; IV characteristics; Kelvin probe force microscopy; Nanorod devices; Orders of magnitude; Power conversion efficiencies; Recombination rate; TiO; Atomic force microscopy; Carrier lifetime; Conversion efficiency; Efficiency; Morphology; Nanorods; Phase separation; Photovoltaic effects; Surface morphology; Thiophene; Titanium dioxide; Heterojunctions |
Appears in Collections: | 材料科學與工程學系 |
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