Integrated thin-film rechargeable battery on α-Si thin-film Solar cell

摘要

In this paper we reported on fabrication and characterization of a composite harvesting device integrated thin-film rechargeable battery on α-Si thin-film solar cell. The α-Si thin-film solar cell typically presented open-circuit voltage of 4.3 V, short-circuit current of 15.4 mA/cm~2 and efficiency of 7.4%. The thin-film rechargeable battery composed of Nb_2O_5/LiPON/LiMn_2O_4 systems fabricated using dry process, which showed the initial discharge capacity of about 215 μAh (or 12.4 μAh/cm~2), the cycleabilty for discharge was good at keeping about 12.3 μAh/cm~2 with a small decreasing ratio of 0.1% per cycle and the coulombic efficiency was all over 95% for the 100 cycles. On the other hand, the discharge capacity of approximately 80% was provided by the self-charging of the solar cell for 10 min, and the coulombic efficiency was also over 95%.