Thickness-modulated in-plane Bi2O2Se homojunctions for ultrafast high-performance photodetectors<xref rid="cpb_28_12_128502fn1" ref-type="fn">*</xref><fn id="cpb_28_12_128502fn1"><label>*</label>Project supported by the National Natural Science Foundation of China (Grant No. 61705066), the Open Fund of State Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications), China (Grant No. IPOC2018B004), and the National Key Research and Development Program, China (Grant No. 2016YFA0202401).</fn>

Thickness-modulated in-plane Bi₂O₂Se homojunctions for ultrafast high-performance photodetectors**

Project supported by the National Natural Science Foundation of China (Grant No. 61705066), the Open Fund of State Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications), China (Grant No. IPOC2018B004), and the National Key Research and Development Program, China (Grant No. 2016YFA0202401).

Hong Cheng-Yun¹, Huang Gang-Feng¹, Yao Wen-Wen², Deng Jia-Jun², Liu Xiao-Long^{1, 3, †}

(a) The OM image of a Bi₂O₂Se IPJ; (b) the AFM image of the region outlined by yellow square in panel (a); (c) the reconstructed AFM 3D image of panel (b); (d) the height profile along two yellow dash lines in panel (b); (e) the OM image of Bi₂O₂Se IPJ formed by two layers merging; (f) the AFM image of the region enclosed by red square in panel (e); (g) the height profile along red dash lines in panel (f).