Reconstructed nano-titanyl phthalocyanine for high-performance photodetection

Abstract

With the rising demand for high-performance organic small-molecule semiconductor materials in optoelectronic devices, reconstructing specific morphologies of nano-phthalocyanines is of great significance. Herein, TiOPc ultrathin nanosheets (UNSs) and nanosheets (NSs) are reconstructed using a simple and effective physical vapor deposition (PVD) method. The thickness and lateral sizes of the UNSs are between 1 to 10 nm and 50–200 nm, respectively. The subsequent experimental results of photodetection exhibited that the photocurrent of UNSs/NSs is nearly four to five orders of magnitude higher than that of the raw materials at 10 V and show good stability. The photoresponsivity of the UNSs is about 3.37 × 10⁴ times that of the raw materials, demonstrating good photoelectric conversion capability. Under different wavelengths, the photocurrents of the UNSs are consistently higher than those of the NSs and the raw materials. The NSs exhibit the fastest response speed, with rise and fall times of 194 ms and 193 ms, respectively, under 395 nm. Furthermore, the photoresponsive properties of the reconstructed UNSs and NSs are better than those of most other reported MPc materials. Our results indicate that TiOPc UNSs and NSs hold great application prospects in high-performance optoelectronic devices.