摘要：Focusing on the linearity shortcoming on a bipolar low noise amplifier(LNA),a new 6 ~14GHz four stage SiGe HBT LNA is *** amplifier adopts a method of gain allocation on multiple stages to avoid the limitation on linearity especially with the addition of negative gain on the third *** realize gain flatness,extra zero is introduced to compensate the gain roll-off formed by pole,and local shunt-shunt negative feedback is used to widen the bandwidth as well as optimize circuit' s *** results have shown that in 6 ~14GHz,this circuit achieves noise figure(NF) less than 3dB,gain of 17.8dB(+0.2dB),input and output reflection parameters of less than- 10 dB,and the K factor is above 1.15.

摘要：设计合成高效n型小分子半导体作为钙钛矿太阳能电池的电子传输层对实现低温、可溶液加工的钙钛矿太阳能电池具有重要意义.本文合成了三个低LUMO能级、基于苊烯酰二亚胺的小分子受体材料AI1, AI2, AI3,系统表征了其光物理性质及电化学、热力学性质,研究了其在钙钛矿太阳能电池器件中的应用.当使用TiO_2/AI1作为电子传输层时,钙钛矿太阳能电池的平均光电转换效率为15%,比单独TiO_2电子传输层11.7%的平均光电转换效率有较大提升,表明基于苊烯酰二亚胺的小分子AI1, AI2, AI3是良好的电子传输层材料,可实现低温、可溶液加工的高效钙钛矿太阳能电池.