The high frequency plasma enhanced chemical vapor deposition (HF-PECVD) is a well applicable deposition technique for large area and high rate deposition for silicon thin film solar cell application. This paper presents the properties of hydrogenated amorphous silicon (a-Si:H) films and high efficiency of p-i-n solar cells prepared using RF (27.1 MHz) excitation frequency. The influence of the power (10-40 W) and pressure (20-50 Pa) used during the deposition of absorber layers in p-i-n solar cells using pure silane on the properties of the films and solar cells are investigated. We summarize the power and pressure effect on properties and growth mechanism of a-Si:H films. It was found that the a-Si:H films prepared under various deposition conditions show widely various deposition rate, optical-electronic properties and microstructure. AZO films between two layers (n-layer and metal), the AZO back reflector was successfully implemented in a-Si:H singlejunction solar cells. After optimizing the deposition parameters, the amorphous silicon based thin film silicon solar cells with efficiency of 9.15 % have been fabricated by HF-PECVD. These are very encouraging results for future fabrication of high efficiency thin film solar cells using by HF-PECVD.
This paper develops fifth-generation-sized silicon thin-film tandem photovoltaic (PV) modules with animated images. Front PV cell stripes are created using a laser scribing technique, and specially edited and shifted images are printed onto the back glass. After encapsulating the front PV module with the back glass, the animated image effect can then be clearly seen from various positions. The PV module that can display three images has a stabilized power output of 87 W. The remarkable features of this module such as its animated image display, semitransparency, and acceptable power loss give it great potential for use in building-integrated photovoltaics. This paper could help improve the aesthetic appearance of PV modules, which may increase users' or architects' willingness to install PV modules on buildings.
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