硅BC8量子点太阳能电池中的多重激子效应

多重激子效应是指在纳米半导体晶体中，量子点吸收一个高能光子而产生多个电子-空穴对的过程，该效应可以提高单结太阳电池能量转换效率。利用碰撞电离机制和费米统计模型计算了工作温度300 K的单结硅BC8量子点太阳能电池在AM1.5G太阳光谱下的能量转换效率。对于波长在280~580 nm的入射光，多重激子效应可以大幅增强硅BC8量子点直径d>5.0 nm的量子点太阳电池的能量转换效率。硅纳米量子点的直径d=6.3~6.4 nm时，最大能量转换效率为51.6%。

Multiple Exciton Generation in Si BC8 Quantum Dots Solar Cell

Multiple exciton generation(MEG) is a process whereby multiple electron-hole pairs or excitons are produced upon absorption of a single photon in semiconductor quantum dots(QDs). This effect represents a promising route to increase solar conversion efficiencies in single-junction photovoltaic cells. MEG in Si BC8 QDs is based on impact ionization and statistical Fermi. The power conversion efficiency for Si QDs solar cells was calculated under AM1.5G solar spectrum with the cell temperature at 300 K. For the incident wavelength of 280-580 nm, the power conversion efficiency can be improved by MEG effect for d>5.0 nm Si QDs. For Si BC8 QDs with d=6.3-6.4 nm, the maximum energy conversion efficiency is 51.6%.