ABSTRACT

In this chapter, the authors review the work on photodetectors based on colloidal quantum dots (QDs) in the light of these advantages. They discuss the potential of using QD for high-resolution photodetector arrays. The chapter focuses on the application of semiconductor colloidal QD in photodetection. The authors use examples of the recent development on colloidal QD photodetectors to illustrate the unique advantages of utilizing QD for photodetection, focusing on high spatial resolution, layer-by-layer self-assembly, and integration with plasmonics. The chapter introduces photodetectors fabricated by two different solution-processing methods—drop casting and electrostatic layer-by-layer self-assembly—then discusses the device performance. It gives an example that demonstrates the flexibility of integrating a QD photodetector with other functional components. The chapter explores the prospect of making ultrahigh-resolution imaging and sensor arrays by studying the crosstalk in a QD photodetector array.