Carbon-based fully printable self-powered ultraviolet perovskite photodetector: Manganese-assisted electron transfer and enhanced photocurrent

Shuhong Xu,Chunlei Wang,Guangguang Huang,Haibao Shao,Yiping Cui

doi:10.1177/1847980420925674

Shuhong Xu, Chunlei Wang + Show 3 more

Open Access

https://doi.org/10.1177/1847980420925674

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Abstract

In this work, we improved the photocurrent of self-powered ultraviolet photodetector via doping manganese in CsPbCl3 perovskite nanocrystals light harvester. The doped manganese in nanocrystals has the following three features to assist electron transfer from CsPbCl3 nanocrystals to titanium dioxide: (i) the fast exciton-to-manganese energy transfer process benefits for competing electrons with perovskite exciton recombination, (ii) the charge carrier lifetime is very long for manganese d-states due to its spin and orbital forbidden transition, and (iii) the electrons can effectively transfer to the titanium dioxide layer from 4T1 of manganese d-states due to the smaller energy barrier. Based on the above, the self-powered photocurrent density of photodetectors has nearly twice enhancement from 0.08 mA·cm−2 to 0.14 mA·cm−2 and a high responsivity up to 7.3 mA·W−1 was achieved at 340 nm.

Highlights

Since PDs have similar working principle to that of solar cells (SCs), we expect that the doping of Mn inside CsPbCl3 can be helpful to improve the photocurrent responsivity of selfpowered UV PD
As-prepared PDs have three following main advantages: (i) the Mn: CsPbCl3 NCs work as UV co-absorbers to offset the low absorption coefficient of TiO2 in TiO2/zirconium dioxide (ZrO2)/carbon triple-layer mesoscopic scaffold (TMS); (ii) the electrons can be efficiently extracted from CsPbCl3 NCs to TiO2 via Mn-assisted electron transfer (ELT)
The photocurrent of self-powered UV PDs was improved from 0.08 mAÁcmÀ2 to 0.14 mAÁcmÀ2 and a high responsivity up to 7.3 mAÁWÀ1 was obtained at 340 nm; (iii) the PDs in this work are made by silk screen printing technology, which is convenient and compatible with low-cost carbon counter electrodes

Summary

Introduction

The ozone layer of the atmosphere can block the majority of ultraviolet (UV)-C (100 l < 280 nm) radiation according to the International Commission on Illumination, UV-A and B (280 l < 400 nm) radiation can still reach the earth’s surface and be the culprit for many diseases.[1,2] For monitoring the UV index, it is important to develop UV photodetectors (PDs), especially for the selfpowered UV PDs from the view of being energy saving, portable, and miniature.[3,4,5,6,7,8,9] In the past few years, many selfpowered UV PDs have been explored from materials to devices to extract the charges efficiently.[10,11,12,13,14,15,16,17,18,19] the photocurrent responsivity of these PDs is still lower than the visible light PDs. Since PDs have similar working principle (departure of electrons and holes from light harvester layer) to that of SCs, we expect that the doping of Mn inside CsPbCl3 can be helpful to improve the photocurrent responsivity of selfpowered UV PD. We fabricated the carbon-based fully printable self-powered perovskite UV PDs with improved performance by doping Mn in CsPbCl3 NCs light harvester.

Results

Conclusion