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Efficient $ReSe_{2}$ Photodetectors with CVD Single-Crystal Graphene Contacts
| Content Provider | MDPI |
|---|---|
| Author | Silva, Bruna Rodrigues, João Sompalle, Balaji Liao, Chun-Da Nicoara, Nicoleta Borme, Jérôme Cerqueira, Fátima Claro, Marcel Sadewasser, Sascha Alpuim, Pedro Capasso, Andrea |
| Copyright Year | 2021 |
| Description | Rhenium-based 2D transition metal dichalcogenides such as $ReSe_{2}$ are suitable candidates as photoactive materials for optoelectronic devices. Here, photodetectors based on mechanically exfoliated $ReSe_{2}$ crystals were fabricated using chemical vapor deposited (CVD) graphene single-crystal (GSC) as lateral contacts. A “pick & place” method was adopted to transfer the desired crystals to the intended position, easing the device fabrication while reducing potential contaminations. A similar device with Au was fabricated to compare contacts’ performance. Lastly, a CVD hexagonal boron nitride (hBN) substrate passivation layer was designed and introduced in the device architecture. Raman spectroscopy was carried out to evaluate the device materials’ structural and electronic properties. Kelvin probe force measurements were done to calculate the materials’ work function, measuring a minimal Schottky barrier height for the $GSC/ReSe_{2}$ contact (0.06 eV). Regarding the electrical performance, I-V curves showed sizable currents in the $GSC/ReSe_{2}$ devices in the dark and under illumination. The devices presented high photocurrent and responsivity, along with an external quantum efficiency greatly exceeding 100%, confirming the non-blocking nature of the GSC contacts at high bias voltage (above 2 V). When introducing the hBN passivation layer, the device under white light reached a photo-to-dark current ratio up to $10^{6}$. |
| Starting Page | 1650 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano11071650 |
| Journal | Nanomaterials |
| Issue Number | 7 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-06-23 |
| Access Restriction | Open |
| Subject Keyword | Nanomaterials Quantum Science and Technology 2d Materials Transition Metal Dichalcogenides Van Der Waals Heterostructures Hexagonal Boron Nitride Cvd Optoelectronics Contact Barrier Height |
| Content Type | Text |
| Resource Type | Article |
