CsPbBr₃ Quantum Dots Embedded in ZIF-8 for Broadband Photodetectors

Recently, perovskites have appeared as promising materials for optical sensing because of their excellent optoelectronic characteristics. However, despite their advantages, addressing the stability issue for commercialization continues to pose a challenge. In this regard, we have demonstrated a perovskite-based broadband photodetector fabrication approach that incorporates Zeolitic Imidazolate Framework (ZIF-8) with quantum dots based of Cesium lead bromide (CsPbBr 3 QDs), achieving unprecedented stability and performance in the spectrum of UV to NIR region. The composite of ZIF-8 with CsPbBr 3 QDs combines the outstanding characteristics of CsPbBr 3 QDs, including high absorption and tunable bandgap, whereby the ZIF-8 framework provides enhanced mechanical integrity with robustness and environmental encapsulation. The porous structure of ZIF-8 accommodates CsPbBr 3 QDs to prevent degradation from atmospheric O 2 and H 2 O while allowing for efficient transport of charge carriers. The fabricated photodetector shows a responsivity of 170 mA/W and a specific detectivity of 1.6 × 10 10 Jones at 532 nm light. In addition, the device possesses excellent long-time stability, retaining about ∼77% of the initial performance after a period of 40 days of air exposure. This innovative integration of ZIF-8 with CsPbBr 3 QDs marks a departure from the long-known environmental instability of perovskite photodetectors and opens up possibilities for advanced optoelectronic applications. This study sets a benchmark in the design and performance of photodetectors by offering an effective and comprehensive solution to the long-standing environmental instability of perovskite photodetectors. It combines the versatility of metal–organic frameworks with the best optoelectronic properties offered by QDs.