Abstract
To improve the performance of the hybrid solar cells based on electrospun zinc oxide nanofibers/poly(3-hexylthiophene) (ZnO/P3HT), we modified the ZnO nanofibers with nanocrystalline cadmium sulfide (CdS) by solution process and successfully obtained CdS/ZnO core–shell nanofibers. The CdS modification at the optimum condition can dramatically improve all photovoltaic parameters and increase the power conversion efficiency of the hybrid solar cells for over 100%. In addition, the lifetimes of carriers in the hybrid solar cells characterized by impedance analyzer become much longer after the modification of CdS. The effect of CdS modification on the devices can be mainly attributed to the cascaded energy band structure of the heterojunction that favors charge transport process and thus increases the efficiencies of the devices.
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