Effect of emitter layer doping concentration on the performance of silicon thin film heterojunction solar cell

A novel type of n/i/i/p heterojunction solar cell with a-Si:H(15 nm)/a-Si:H(10 nm)/ epitaxial c-Si(47 μm)/epitaxial c-Si(3 μm) structure is fabricated by using the layer transfer technique, and the emitter layer is deposited by hot-wire chemical vapour deposition. The effect of the doping concentration of emitter layer S_d (S_d=PH₃/(PH₃+SiH₄+H₂)) on the performance of the solar cell is studied by means of current density-voltage and external quantum efficiency. The results show that the conversion efficiency of the solar cell first increases to a maximum value and then decreases with S_d increasing from 0.1% to 0.4%. The best performance of the solar cell is obtained at S_d = 0.2% with an open circuit voltage of 534 mV, a short circuit current density of 23.35 mA/cm², a fill factor of 63.3%, and a conversion efficiency of 7.9%.     

铜卟啉金属有机框架材料用于高性能锂硫电池

利用卟啉配体与金属离子的配位特性,通过后修饰将铜离子与卟啉基金属有机框架材料(PCN-222)配位,得到铜卟啉金属有机框架材料(PCN-222-Cu),并首次用于锂硫电池。借助紫外可见光谱(UV-Vis)、粉末X射线衍射(PXRD)、N_2吸附-脱附测试、扫描电子显微镜(SEM)、循环伏安(CV)和恒电流充放电测试等表征手段对材料的晶相结构、形貌和电化学性能进行了系统的研究。其中UV-Vis结果表明,Cu~(2+)与卟啉环成功配位。电化学测试结果表明,负载硫的PCN-222-Cu(S-in-PCN-222-Cu)电极在1C的倍率下循环300周后可逆比容量为840 mAh·g~(-1)。当倍率提高到3C时,循环800周后的容量仍保持430 mAh·g~(-1),每周容量衰减率为0.042%。S-in-PCN-222-Cu电极的电化学性能远优于S-in-PCN-222,说明配体上的Cu~(2+)与卟啉环的协同作用能有效降低电化学极化,从而显著提升卟啉基金属有机框架材料用作硫载体的电化学性能和循环稳定性。     

Effect of emitter layer doping concentration on the performance of a silicon thin film heterojunction solar cell

A novel type of n/i/i/p heterojunction solar cell with a-Si:H(15nm)/a-Si:H(10nm)/ epitaxial c-Si(47μm)/epitaxial c-Si(3μm) structure is fabricated by using the layer transfer technique, and the emitter layer is deposited by hot wire chemical vapour deposition. The effect of the doping concentration of the emitter layer S d (Sd =PH3 /(PH3 +SiH4 +H2 )) on the performance of the solar cell is studied by means of current density-voltage and external quantum efficiency. The results show that the conversion efficiency of the solar cell first increases to a maximum value and then decreases with S d increasing from 0.1% to 0.4%. The best performance of the solar cell is obtained at S d = 0.2% with an open circuit voltage of 534 mV, a short circuit current density of 23.35mA/cm2 , a fill factor of 63.3%, and a conversion efficiency of 7.9%.     

灯丝温度对热丝CVD法制备p型氢化纳米晶硅薄膜微结构与光电性能的影响

本文采用热丝化学气相沉积法在不同灯丝温度(1650 - 1850℃)下沉积了p型氢化纳米晶硅薄膜,研究了灯丝温度对薄膜微结构、光学性能及电学性能的影响.结果表明,随着灯丝温度的升高,薄膜的晶化率先增大后略微减小,最大值是55.5;.载流子浓度和霍尔迁移率先分别从5×1017 cm-3和0.27 cm2/V·s增加到1.32×1020 cm-3和0.43 cm2/V·s后略微减小,同时电导率从0.02 S/cm显著增加到8.95 S/cm,而电导激活能则从271.5 meV急剧减小至25 meV.     

水溶性CdTe量子点的合成及影响因素研究

本文以巯基乙酸(TGA)为稳定剂,在水相中合成了高荧光CdTe量子点.其荧光发射波长在507 ～ 628nm范围内可调,最窄半峰宽37 nm,粒径约3.4nm,量子产率达42.1％.本实验在固定前躯体配比不变的情况下,考察了前躯体中镉离子的浓度、pH及回流时间对CdTe生长的影响.并用透射电子显微镜(TEM),荧光分光光度计(FS),X射线衍射仪(XRD)等手段对制备的量子点进行了表征.结果表明:CdTe量子点的尺寸随回流时间而增长;反应的pH对量子点的荧光强度有显著影响;镉离子的浓度越大,量子点的生长速度越快,荧光强度却随之降低.     

微波皂化返滴定法快速测定白酒中的总酯

研究了在密封条件下微波皂化返滴法测定白酒中总酯的各种影响因素，建立了快速测定白酒中总酯的新方法。微波功率为中档（400W），皂化时间为5min。用于3种香型白酒样品中总酯的测定，RSD≤2．6％，加标回收率为96．1％－105．9％