1.State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China
2.Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Dalian Minzu University, Dalian, 116600, China
3.State Kay Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
Wen Xu (xuwen@dlnu.edu.cn)
Hongwei Song (songhw@jlu.edu.cn)
纸质出版日期:2022-05-31,
网络出版日期:2022-04-11,
收稿日期:2022-01-13,
修回日期:2022-03-02,
录用日期:2022-03-24
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A novel approach for designing efficient broadband photodetectors expanding from deep ultraviolet to near infrared[J]. LSA, 2022,11(5):842-854.
Ding, N. et al. A novel approach for designing efficient broadband photodetectors expanding from deep ultraviolet to near infrared. Light: Science & Applications, 11, 842-854 (2022).
A novel approach for designing efficient broadband photodetectors expanding from deep ultraviolet to near infrared[J]. LSA, 2022,11(5):842-854. DOI: 10.1038/s41377-022-00777-w.
Ding, N. et al. A novel approach for designing efficient broadband photodetectors expanding from deep ultraviolet to near infrared. Light: Science & Applications, 11, 842-854 (2022). DOI: 10.1038/s41377-022-00777-w.
Broadband photodetection (PD) covering the deep ultraviolet to near-infrared (200–1000 nm) range is significant and desirable for various optoelectronic designs. Herein
we employ ultraviolet (UV) luminescent concentrators (LC)
iodine-based perovskite quantum dots (PQDs)
and organic bulk heterojunction (BHJ) as the UV
visible
and near-infrared (NIR) photosensitive layers
respectively
to construct a broadband heterojunction PD. Firstly
experimental and theoretical results reveal that optoelectronic properties and stability of CsPbI
3
PQDs are significantly improved through Er
3+
doping
owing to the reduced defect density
improved charge mobility
increased formation energy
tolerance factor
etc. The narrow bandgap of CsPbI
3
: Er
3+
PQDs serves as a visible photosensitive layer of PD. Secondly
considering the matchable energy bandgap
the BHJ (BTP-4Cl: PBDB-TF) is selected as to NIR absorption layer to fabricate the hybrid structure with CsPbI
3
: Er
3+
PQDs. Thirdly
UV LC converts the UV light (200–400 nm) to visible light (400–700 nm)
which is further absorbed by CsPbI
3
: Er
3+
PQDs. In contrast with other perovskites PDs and commercial Si PDs
our PD presents a relatively wide response range and high detectivity especially in UV and NIR regions (two orders of magnitude increase that of commercial Si PDs). Furthermore
the PD also demonstrates significantly enhanced air- and UV- stability
and the photocurrent of the device maintains 81.5% of the original one after 5000 cycles. This work highlights a new attempt for designing broadband PDs
which has application potential in optoelectronic devices.
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