Effect of Polymer Processing on the Performance of Poly(3-hexylthiophene)/ZnO Nanorod Photovoltaic Devices

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• 作者：Dana C. Olson ; Yun-Ju Lee ; Matthew S. White ; Nikos Kopidakis ; Sean E. Shaheen ; David S. Ginley ; James A. Voigt ; Julia W. P. Hsu
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：November 8, 2007
• 年：2007
• 卷：111
• 期：44
• 页码：16640 - 16645
• 全文大小：331K
• 年卷期：v.111,no.44(November 8, 2007)
• ISSN：1932-7455

文摘

Effective infiltration of the polymer into the nanostructured oxide is critical for optimizing the performanceof hybrid -conjugated polymer/nanostructured metal oxide semiconductor photovoltaic devices. Weinvestigated the effect of polymer processing parameters, solvent selection, and thermal annealing on poly(3-hexylthiophene) (P3HT)/ZnO nanorod photovoltaic devices and found that these play an important role inthe degree of polymer infiltration and the subsequent device performance. We demonstrate that usingdichlorobenzene as a solvent produced better performance devices than using chloroform. In addition, theinfiltration of P3HT into the ZnO nanorod array has been improved through annealing and subsequent slowcooling. Time-resolved microwave conductivity studies reveal an increase in the photoconductivity of thecomposite devices with annealing, resulting from changes in both the polymer and ZnO. The device performancewas shown to increase with enhanced infiltration, and the devices that had been slow cooled from melt at225 C demonstrated a V_OC of 440 mV, a J_SC of 1.33 mA/cm², a fill factor of 48%, and a power conversionefficiency of 0.28%. In contrast to previously published results on P3HT infiltrated into mesoporous TiO₂(Appl. Phys. Lett. 2003, 83, 3380), we found that the device performance improves with increasing amountof the polymer embedded in the ZnO arrays, through proper solvent selection and polymer processing.