近年來，鹵化物鈣鈦礦作為光電子器件材料引起了極大的關注。無機鈣鈦礦通常具有高量子效率，長光載流子壽命和快速電荷轉移特性。通過簡便的熱注入法合成了光致發光光譜位於640 nm的CsPbBr1.2I1.8量子點。吸收光譜顯示CsPbBr1.2I1.8量子點能隙約為1.93 eV。在本研究中，製造了基於銀奈米粒子與CsPbBr1.2I1.8量子點異質結構的光電探測器。所製備的光電檢測器具有優異的性能，響應時間快和檢測率高。銀奈米粒子與入射光相互作用，銀奈米粒子的電子將隨入射光的電場振盪，產生局部表面電漿共振。銀納米粒子的局部表面電漿共振可以將光探測器的光響應提高約1.6倍。

In recent years, halide perovskites have attracted enormous attention as promising materials for optoelectronic devices. Inorganic perovskites often have high quantum efficiency, long photocarrier lifetime and fast charge transfer. CsPbBr1.2I1.8 quantum dots with photoluminescence spectrum located at 640 nm were synthesized by a facile hot-injection method. The UV-vis absorption spectrum exhibits that the bandgap absorption is around 1.93 eV. In the present research, a photodetector based on Ag NPs/ CsPbBr1.2I1.8 QDs heterojunction was fabricated. The as-prepared photodetector had excellent performance with fast response time and high detectivity. According to the localized surface plasmon resonance (LSPR), the electrons of Ag nanoparticles will oscillate with the electric field of incident light. The LSPR of Ag nanoparticles was found to enhance the photoresponse of the photodetector by about 1.6 times.

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