CsPbBrI2量子点制备及其光探测器性能

采用热注入法制备空气稳定性良好的CsPbBrI2量子点,以375 nm的脉冲激光作为激发光源研究其光致发光性能.通过旋涂的方式制备相应薄膜,将其作为光敏层应用到光探测器,并对器件的光电子性能和稳定性进行详细研究.结果表明:CsPbBrI2量子点在635nm附近有强烈的荧光效应,光谱发光峰较窄,半峰宽约为35 nm.CsPbBrI2量子点禁带宽度为1.90eV,制备的探测器光检测带宽从紫外光260nm到红光650 nm,光响应度为0.26 A/W,高开/关比高达104,上升/衰减时间为3.5 ms/3.5 ms.在25℃,湿度在25%~35%大气环境下存储60天,性能与初始值相比几乎没有变化.CsPbBrI2量子点具有优异的稳定性、可制备高性能的宽带光检测和易于制造等优点,具备一定的应用前景.     

模拟研究p型a-Si∶H对HIT太阳电池性能的影响

使用AFORS-HET软件模拟研究HIT太阳电池能带结构,讨论了发射区p型反转层的形成及影响因素,及其对电池性能的影响。结果表明:在n型单晶硅内,与p型非晶硅异质结界面处,形成p型反转层;p-Si∶H的掺杂浓度可调节费米能级位置,进而影响反转层的形成。HIT电池类似于p-n同质结电池,p型反转层作为太阳电池发射层,对太阳电池的性能起决定性作用。     

光后向散射法测烟尘浓度的实验研究

设计了一套具有高灵敏度的利用光后向散射法测烟尘浓度的装置，不仅具有实时、在线、连续测量等优点，而且价格低廉、便于安装.通过理论分析获得散射光强与烟尘浓度的关系，并通过自行设计的测量装置测量了不同烟尘浓度下的散射光强，验证了理论的正确性并获得了描述后向散射光强的电信号强度与烟尘质量浓度关系的曲线.实验结果证明在烟尘浓度较低时，后向散射光强与烟尘浓度有很好的线性关系.     

Measurements of pressure induced self-broadening and frequency shift coefficients of methane R9 manifold of 2v_3 band

An external-cavity diode laser (ECDL) has been used to investigate pressure-induced self-broadening as well as frequency shift of 2v3 band R9 manifold of methane. A phase sensitivity detection technology has been employed to determine the pressure induced frequency shift coefficient, however, which is obtained by line shape analyses of the recorded absorption spectrum. F1 and F2 unresolved double lines near 6105.626 cm-1 were measured as an object because they are often used to the high sensitivity detection of trace methane. The results show that the self-broadening and pressure induced frequency shift coefficients are 0.0232±0.003 and 0.0055±　0.0007 MHz/Pa, respectively.