TY - JOUR
T1 - Filter-Free Band-Selective Organic Photodetectors
AU - Lan, Zhaojue
AU - Lau, Ying Suet
AU - Wang, Yiwen
AU - Xiao, Zuo
AU - Ding, Liming
AU - Luo, Dan
AU - Zhu, Fu Rong
N1 - Funding Information:
This work was financially supported by the Research Grants Council of Hong Kong Special Administrative Region, China, General Research Fund (12302817 and 12303920), and NSFC/RGC Joint Research Scheme (N_HKBU201/19). L.D. thanks the National Key Research and Development Program of China (2017YFA0206600) and the National Natural Science Foundation of China (51773045, 21772030, 51922032, and 21961160720) for financial support.
Funding Information:
This work was financially supported by the Research Grants Council of Hong Kong Special Administrative Region, China, General Research Fund (12302817 and 12303920), and NSFC/RGC Joint Research Scheme (N_HKBU201/19). L.D. thanks the National Key Research and Development Program of China (2017YFA0206600) and the National Natural Science Foundation of China (51773045, 21772030, 51922032, and 21961160720) for financial support.
PY - 2020/12/17
Y1 - 2020/12/17
N2 - The present band-selective photodetection is realized by incorporating different optical filters with broadband photodetectors (PDs). However, the use of the optical filters reduces the overall PD sensitivity. This work reports on the effort to develop high-performance filter-free band-selective organic photodetectors (OPDs) having a heterostructure photoactive layer architecture, comprising a semiconducting shorter-wavelength light depletion layer and a bulk heterojunction (BHJ) layer with an extended absorption to longer wavelengths. The filter-free band-selective photodetection is realized by adjusting the difference in wavelengths between the transmission cut-off wavelength of the semiconducting light depletion layer and the absorption edge of the BHJ layer. For example, a filter-free visible-blind near-infrared OPD, with a spectral rejection ratio of 100, a high responsivity of 0.39 A W−1, a high −3 dB cutoff frequency of 80 kHz, and a fast response time of ≈7 µs, is demonstrated, offering an exciting option for a plethora of applications in imaging and light communications.
AB - The present band-selective photodetection is realized by incorporating different optical filters with broadband photodetectors (PDs). However, the use of the optical filters reduces the overall PD sensitivity. This work reports on the effort to develop high-performance filter-free band-selective organic photodetectors (OPDs) having a heterostructure photoactive layer architecture, comprising a semiconducting shorter-wavelength light depletion layer and a bulk heterojunction (BHJ) layer with an extended absorption to longer wavelengths. The filter-free band-selective photodetection is realized by adjusting the difference in wavelengths between the transmission cut-off wavelength of the semiconducting light depletion layer and the absorption edge of the BHJ layer. For example, a filter-free visible-blind near-infrared OPD, with a spectral rejection ratio of 100, a high responsivity of 0.39 A W−1, a high −3 dB cutoff frequency of 80 kHz, and a fast response time of ≈7 µs, is demonstrated, offering an exciting option for a plethora of applications in imaging and light communications.
KW - band-selective photodetection
KW - filter-free photodetection
KW - light communication
KW - near-infrared absorption
KW - organic photodetectors, photoactive layers
UR - http://www.scopus.com/inward/record.url?scp=85093511170&partnerID=8YFLogxK
U2 - 10.1002/adom.202001388
DO - 10.1002/adom.202001388
M3 - Journal article
AN - SCOPUS:85093511170
SN - 2195-1071
VL - 8
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 24
M1 - 2001388
ER -