Blue photodetectors(PDs)are attracting great attention for various applications.Commercial blue PDs based on inorganic GaP or InGaN absorbers are limited by their expensive,complex,and high-temperature fabrication tec...Blue photodetectors(PDs)are attracting great attention for various applications.Commercial blue PDs based on inorganic GaP or InGaN absorbers are limited by their expensive,complex,and high-temperature fabrication techniques.Organic absorber-based blue PDs still have much lower photode-tecting properties than inorganic blue PDs.In this study,a high-performance self-powered blue PD is developed using methylammonium lead halide(MAPbX_(3);X=I,Br,and Cl)perovskites based on the eco-nomic and facile solution process at low temperatures.Optimal composition is obtained through halide-composition engineering.Our best-performing device exhibits an average external quantum efficiency and an average detectivity of 42.7%and 8.65×10^(11) Jones,respectively,within the blue region.The peak responsivity of the proposed PD is 0.174 A W^(−1) at 455 nm,which is comparable to that of commercial gallium phosphide blue PD(0.180 A W^(−1) at 470 nm).Moreover,the proposed device exhibits excellent environmental stability under ambient air conditions.These findings will act as a basis for next-generation image sensor technologies,such as vertically stacked red/green/blue PDs.展开更多
基金This work was financially supported by the National Re-search Foundation of Korea(NRF)funded by the Ministry of Science,ICT(Nos.NRF-2019M3D1A2104108,2019R1A2C1084010,2020R1A4A2002161,and 2020R1A6A3A13073172)。
文摘Blue photodetectors(PDs)are attracting great attention for various applications.Commercial blue PDs based on inorganic GaP or InGaN absorbers are limited by their expensive,complex,and high-temperature fabrication techniques.Organic absorber-based blue PDs still have much lower photode-tecting properties than inorganic blue PDs.In this study,a high-performance self-powered blue PD is developed using methylammonium lead halide(MAPbX_(3);X=I,Br,and Cl)perovskites based on the eco-nomic and facile solution process at low temperatures.Optimal composition is obtained through halide-composition engineering.Our best-performing device exhibits an average external quantum efficiency and an average detectivity of 42.7%and 8.65×10^(11) Jones,respectively,within the blue region.The peak responsivity of the proposed PD is 0.174 A W^(−1) at 455 nm,which is comparable to that of commercial gallium phosphide blue PD(0.180 A W^(−1) at 470 nm).Moreover,the proposed device exhibits excellent environmental stability under ambient air conditions.These findings will act as a basis for next-generation image sensor technologies,such as vertically stacked red/green/blue PDs.
