AI 中文总结
该研究制备20个不同加工条件的pSi样品，用多种表征手段分析其性质关联，发现单一参数无法描述其多尺度行为，且量子线/量子点尺寸随电流密度增大而减小。
AI 中文摘要
我们报道了电化学加工条件与多孔硅（pSi）的形貌、化学及光学性质之间关联的系统研究。通过改变电流密度、刻蚀时间和氢氟酸浓度，从掺硼（100）晶体硅制备了20个pSi样品。采用扫描电子显微镜、傅里叶变换红外光谱和光致发光技术对所得结构进行表征。二维孔隙率仅呈中等变化，而多孔层厚度随刻蚀时间和电流密度增加而增大；氧化硅与硅氢化物的比值变化相对较小。对校正后的光致发光光谱采用含局域表面态跃迁的四分量量子线/量子点模型拟合，提取的量子线和量子点尺寸随电流密度增加呈系统性减小，而在375 nm激发下的光致发光峰值未随加工条件呈现明显单调依赖关系。结果表明，单一参数不足以充分描述多孔硅的多尺度行为。
英文摘要
We report a systematic study of the correlations among electrochemical processing conditions and the morphological, chemical, and optical properties of porous silicon (pSi). Twenty pSi samples were fabricated from boron-doped (100) crystalline silicon by varying current density, etching time, and hydrofluoric-acid concentration. Scanning electron microscopy, Fourier-transform infrared spectroscopy, and photoluminescence were used to characterize the resulting structures. The two-dimensional porosity varied only moderately, whereas porous-layer thickness increased with etching time and current density. The silicon oxide to silicon hydride ratio showed comparatively small variations. Corrected photoluminescence spectra were fitted with a four-component quantum-wire/quantum-dot model including localized surface-state transitions. The extracted quantum-wire and quantum-dot dimensions decreased systematically with increasing current density, while the photoluminescence maximum under 375 nm excitation showed no clear monotonic dependence on processing conditions. The results demonstrate that no single descriptor adequately captures the multiscale behavior of porous silicon.
Comments10 pages, 6 figures, 1 table
