Flexible Self-Powered Photoelectrochemical Photodetectors Based on Cellulose-Based Hydrogel Electrolytes and Bi2O2Se Nanosheets,ACS Applied Nano Materials

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Flexible Self-Powered Photoelectrochemical Photodetectors Based on Cellulose-Based Hydrogel Electrolytes and Bi2O2Se Nanosheets
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2024-01-03 , DOI: 10.1021/acsanm.3c04779
Jianzong Li ₁ , Mingfang Wu ₁ , Hanxiao Zhang ₁ , Siqi Li ₁ , Can Wang ₂ , Peiyao Wang ₂ , Jiulong Sha ₁ , Xuelian Zhou _{1,

3}

Affiliation

Photoelectrochemical (PEC)-type photodetectors are gaining significant interest as neoteric self-powered devices, owing to their high spectral responsivity and quick photoresponse. However, the underlying leakage issue makes the aqueous electrolyte contained inside PEC-type photodetectors unsuitable for manufacturing flexible optoelectronics. In this study, we report a flexible, self-powered PEC-type photodetector based on a cellulose-based hydrogel. Using a cellulose-based hydrogel electrolyte as the electron-transferring medium and two-dimensional Bi₂O₂Se nanosheet-coated indium tin oxide glass as the working electrode, the photodetector exhibits excellent self-powered capability. The hydrogel-based PEC photodetector exhibits a broadband photoresponse in the range of 365–850 nm. Moreover, under the condition of an illumination wavelength of 365 nm at a bias voltage of 0.6 V, the photodetector exhibits a responsivity of 0.68 mA/W, a detectivity of 2.44 × 10⁸ Jones, and a fast response time of 85/103 ms, which are comparable to those of photodetectors based on traditional aqueous electrolytes. Additionally, the hydrogel-based PEC photodetectors show good flexibility and stability, maintaining more than 70.3% of their photocurrent density even after 100 cycles of bending at 120°, and no obvious photocurrent decay is observed after storage for 1 week. Based on these results, cellulose-based hydrogel electrolytes have significant potential for future applications in self-powered photodetectors.

中文翻译：

基于纤维素水凝胶电解质和 Bi2O2Se 纳米片的柔性自供电光电化学光电探测器

光电化学（PEC）型光电探测器作为新型自供电设备，由于其高光谱响应度和快速光响应而引起了人们的极大兴趣。然而，潜在的泄漏问题使得 PEC 型光电探测器内包含的水性电解质不适合制造柔性光电器件。在这项研究中，我们报告了一种基于纤维素水凝胶的灵活、自供电 PEC 型光电探测器。该光电探测器采用纤维素基水凝胶电解质作为电子传输介质，二维Bi ₂ O ₂ Se纳米片涂覆的氧化铟锡玻璃作为工作电极，表现出优异的自供电能力。基于水凝胶的 PEC 光电探测器在 365-850 nm 范围内表现出宽带光响应。此外，在照明波长365 nm、偏置电压0.6 V的条件下，光电探测器表现出0.68 mA/W的响应度、2.44×10 ⁸ Jones的探测灵敏度和85/103 ms的快速响应时间。，与基于传统水性电解质的光电探测器相当。此外，基于水凝胶的PEC光电探测器表现出良好的柔韧性和稳定性，即使在120°弯曲100次循环后仍能保持70.3%以上的光电流密度，并且储存1周后没有观察到明显的光电流衰减。基于这些结果，基于纤维素的水凝胶电解质在自供电光电探测器的未来应用中具有巨大的潜力。

更新日期：2024-01-03

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