The Influence of Annealing Process and Template Process on the Photovoltaics of P3HT/PCBM Solar Cells
Date Issued
2010
Date
2010
Author(s)
Su, Meng-Kai
Abstract
Polymer solar cells have attracted considerable attention recently because of the advantages of light weight and easy fabrication process. The most important factor affecting the device performance of polymer solar cells is the morphology of the active layer composed of donor and acceptor. In this research, we have successfully developed two new and simple methods to control the morphology of the active layer. Moreover, UV-vis, XRD, PL, TEM and AFM were employed as primary characterization tools.
In the first approach, a gradient heating system was utilized to improve the traditional solvent annealing route. This method not only increase the absorbance of the donor/acceptor composite but also optimize the morphology of two substances to form a bi-continuous networks, thus lowering the total series resistance and raising the power conversion efficiency of device from 3.52% to 4.02%.
The second approach is taking the advantage of the self-assembly characteristic of P3HT. Firstly, P3HT was mixed with PS of different molecular weights to produce a composite film. The PS was then removed by organic solvent to construct a porous P3HT template. Finally, the P3HT skeleton was infiltrated with PCBM, followed by the thermal evaporation of Al to form a solar device. Both images from AFM and TEM revealed the thus-prepared P3HT/PCBM film showed a mountain-like morphology. These cells demonstrated the best efficiency of 3.25%.
Subjects
morphology
gradient
active layer
SDGs
Type
thesis
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