Bias Light Driving Enables Bandwidth Tunable Photodetectors and Its Applications

Spectrum selective photodetection is urgently demanded and expected to play a disruptive role in optical communications and surveillance. Facilitated detection spectrum tuning of photodetector can be achieved by architecture engineering or bias voltage modulation, which are attributed to carrier regulation from the internal mechanisms. However, the unsatisfactory inefficient carriers manipulating method for the conventional implementation strategies has become the main factor limiting the performance, causing inevitable parameter trade-offs regarding responsivity and response speed. In this work, we demonstrate a series of perovskite/organic integrated photodetectors with tunable bandwidth by manipulating photogenerated carriers with a bias light. The additional bias light was verified to manipulate the transportation and recombination processes of photogenerated carriers of the probe signal. Consequently, a narrowband detector with a response in the near-infrared range and a spectral rejection ratio reaching 1547 was developed. Moreover, a self-driven broadband detector with ultra-high external quantum efficiency that approaches the theoretical limit, reaching 96.68% at 820nm, with a response range covering 300-1000nm, has been developed by boosting bias light. This work provides one of the first investigations into photoelectric conversion under dual-component light conditions. The innovative bias light driving approach and impressive performance offer a fresh perspective on carrier regulation and optoelectronic device investigation.