Eu3+ doped CsPbCl2Br1 nanocrystals glass for enhanced the ultraviolet response of Si photodetectors

Silicon (Si) photodetectors (PDs) have been widely used due to their many excellent properties, however, the extremely weak ultraviolet (UV) photo-response severely affect its future development. In this work, we controlled the concentration of CsPbCl 2 Br 1 NCs in the glass and obtained samples with local emission and high transmittance. Furthermore, we incorporated Eu 3+ into CsPbCl 2 Br 1 perovskite nanocrystals glass (PNG) to achieve efficient ultraviolet (UV) to visible emissions and boost the UV response of Si PDs. Finally, after combining with the CsPbCl 2 Br 1 : Eu 3+ PNG on the Si PDs, the responsivity increased to 0.0088 A/W at 320 nm, which means 8.8 times higher than that of the pristine Si PDs. Moreover, Si PDs based on CsPbCl 2 Br 1 : Eu 3+ PNG exhibited excellent stability, and the photocurrents of the device almost not changed after 60 days. This work offers a novel strategy for improving UV response of Si PDs. • Enhanced the R (reached 0.0088 A/W, 8.8 times of pure Si PDs), D (up to an order of magnitude) and EQE (from 0 to 3.79%) of integrated Si PDs. • An effective enhancement in PLQY (from 6.8% to 28.1%) of CsPbCl 2 Br 1 PNGs by doping Eu 3+ . • The PNG with high transparence was successfully prepared by adjusting the content of CsPbCl 2 Br 1 NCs. • It is found that PNGs effectively avoid the instability in terms of water, thermal and UV light owing to protection of glass matrix.