Fabrication of polycrystalline CdTe thin-film solar cells using carbon electrodes with carbon nanotubes

摘要

The effects of adding carbon nanotubes (CNTs) to carbon back electrodes in polycrystalline CdTe thin-film solar cells were investigated. The CNTs were prepared by arc discharge under atmospheric pressure. The conductivity of the obtained CNT film with a density of 1.65 g/cm(3) was approximately 2.6 x 10(3)S/cm. In the CdTe solar cells using carbon back electrodes with CNTs, the fill factor (FF) was improved as a result of adding CNTs with a concentration of 1 to 5 wt %. The improvement of FF was mainly due to the decrease in the series resistance of the CdTe solar cell. Furthermore, the open-circuit voltage (V-OC) was improved by the CNT addition. The improvement of V-OC was probably due to the reduction of the back barrier at the back contact. (C) 2015 The Japan Society of Applied Physics