Abstract Porphine compounds have potential applications on optoelectronic and gas sensors. Organic films of 2,7,12,17-tetra-tert-butyl-5,10,15,20-tetraaza-21H,23H-porphine (TTBTP) were fabricated by thermal evaporation method. The atomic force microscopy of TTBTP films demonstrates that these films have uniformly distributed grains. As the thickness increases, the grain size increases, and film morphology seem to be uniform with large grains. The Raman spectra of TTBTP powder and films were studied and showed the mean four peaks characterized the TTBTP at 970, 1074, 1308, and 1583 cm−1. The transmittance spectra confirmed the homogeneity of TTBTP films. Also, it is found that TTBTP films have an indirect electronic transition with two energy bandgaps (Eg1 = 1.75 eV and Eg2 = 3.42 eV) and their values decreased as the film thickness increments. The optical constants were calculated, and the refractive index increments with increasing in the film thickness. This outcome might be credited to the interlude of the film in the initial phase of the deposition. The nonlinear optical parameters for TTBTP film were calculated and found that the third-order optical nonlinearity was increased with increasing the film thickness.

中文翻译：

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薄膜厚度对用于光学应用的 2,7,12,17-四-叔丁基-5,10,15,20-四氮杂-21H,23H-卟吩纳米结构薄膜的结构和光学性能的影响

摘要 卟吩化合物在光电和气体传感器方面具有潜在的应用前景。2,7,12,17-四-叔丁基-5,10,15,20-四氮杂-21H,23H-卟吩(TTBTP)有机薄膜采用热蒸发法制备。TTBTP 薄膜的原子力显微镜表明这些薄膜具有均匀分布的晶粒。随着厚度的增加，晶粒尺寸增加，薄膜形态似乎与大晶粒一致。对 TTBTP 粉末和薄膜的拉曼光谱进行了研究，并显示了在 970、1074、1308 和 1583 cm-1 处表征 TTBTP 的平均四个峰。透射光谱证实了 TTBTP 薄膜的均匀性。此外，还发现 TTBTP 薄膜具有具有两个能带隙（Eg1 = 1.75 eV 和 Eg2 = 3.42 eV）的间接电子跃迁，并且它们的值随着薄膜厚度的增加而降低。计算了光学常数，并且折射率随着膜厚度的增加而增加。这一结果可能归因于在沉积的初始阶段薄膜的插曲。计算了TTBTP薄膜的非线性光学参数，发现随着薄膜厚度的增加，三阶光学非线性度增加。