Annealing effects on the photoresponse properties of CdSe nanocrystal thin films

作者：Lou Shiyun; Zhou Changhua^*; Wang Hongzhe; Shen Huaibin; Cheng Gang; Du Zuliang; Zhou Shaomin; Li Lin Song

来源：Materials Chemistry and Physics, 2011, 128(3): 483-488.

DOI：10.1016/j.matchemphys.2011.03.035

• Annealing
• Photoresponse
• CdSe nanocrystal thin films
• Kelvin probe force microscopy

The photoresponse properties of the as-prepared and annealed close-packed CdSe nanocrystal (NC) films were investigated under laser illumination by Kelvin probe force microscopy. The annealing process improved the photoresponse speed of the CdSe NC films. The work function of the annealed CdSe NC films changed more rapidly than that of the non-annealed film in air at room temperature. Combined with X-ray photoelectron spectroscopy measurements and thermogravimetric analysis, the observed phenomena can be interpreted that annealing process removed the organic capping agents completely and eliminated oxide on the CdSe surface, which formed the tunnel barrier between NCs in the CdSe NC films. Consequently, it improved the separation rate of photoelectric charges and thus provided high speed photoresponse.

• 出版日期2011-8-15
• 单位河南大学