Controllable p- and n-type behaviours in emissive perovskite semiconductors

被引:75
作者
Xiong, Wentao [1 ]
Tang, Weidong [1 ]
Zhang, Gan [1 ]
Yang, Yichen [1 ]
Fan, Yangning [1 ]
Zhou, Ke [1 ]
Zou, Chen [1 ,2 ]
Zhao, Baodan [1 ,2 ]
Di, Dawei [1 ,2 ]
机构
[1] Zhejiang Univ, Coll Opt Sci & Engn, Int Res Ctr Adv Photon, State Key Lab Extreme Photon & Instrumentat, Hangzhou, Peoples R China
[2] Zhejiang Univ, ZJU Hangzhou Global Sci & Technol Innovat Ctr, Hangzhou, Peoples R China
基金
中国国家自然科学基金;
关键词
LIGHT-EMITTING-DIODES; HALIDE PEROVSKITES; HOLE-TRANSPORT; SOLAR-CELLS; EFFICIENCY; PASSIVATION; BRIGHT; BLUE;
D O I
10.1038/s41586-024-07792-4
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Reliable control of the conductivity and its polarity in semiconductors is at the heart of modern electronics1-7, and has led to key inventions including diodes, transistors, solar cells, photodetectors, light-emitting diodes and semiconductor lasers. For archetypal semiconductors such as Si and GaN, positive (p)- and negative (n)-type conductivities are achieved through the doping of electron-accepting and electron-donating elements into the crystal lattices, respectively1-6. For halide perovskites, which are an emerging class of semiconductors, mechanisms for reliably controlling charge conduction behaviours while maintaining high optoelectronic qualities are yet to be discovered. Here we report that the p- and n-type characteristics in a wide-bandgap perovskite semiconductor can be adjusted by incorporating a phosphonic acid molecular dopant with strong electron-withdrawing abilities. The resultant carrier concentrations were more than 1013 cm-3 for the p- and n-type samples, with Hall coefficients ranging from -0.5 m3 C-1 (n-type) to 0.6 m3 C-1 (p-type). A shift of the Fermi level across the bandgap was observed. Importantly, the transition from n- to p-type conductivity was achieved while retaining high photoluminescence quantum yields of 70-85%. The controllable doping in the emissive perovskite semiconductor enabled the demonstration of ultrahigh brightness (more than 1.1 x 106 cd m-2) and exceptional external quantum efficiency (28.4%) in perovskite light-emitting diodes with a simple architecture. The charge carrier polarity and concentrations in an emissive perovskite semiconductor can be adjusted by incorporating a molecular dopant widely used for the passivation and structural control of optoelectronic perovskite materials.
引用
收藏
页码:344 / 350
页数:14
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