Qin Shuchao, Chen Xiaoqing, Du Qianqian, Nie Zhonghui, Wang Xinran, Lu Hai, Wang Xizhang, Liu Kaihui, Xu Yongbing, Shi Yi, Zhang Rong, Wang Fengqiu
State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, and School of Physics , Peking University , Beijing 100871 , China.
ACS Appl Mater Interfaces. 2018 Nov 7;10(44):38326-38333. doi: 10.1021/acsami.8b11596. Epub 2018 Sep 20.
Graphene has been widely investigated for use in high-performance photodetectors due to its broad absorption band and high carrier mobility. While exhibiting remarkably strong absorption in the ultraviolet range, the fabrication of a large-scale integrable, graphene-based ultraviolet photodetector with long-term stability has proven to be a challenge. Here, using graphene as a template for C assembly, we synthesized a large-scale all-carbon hybrid film with inherently strong and tunable UV aborption. Efficient exciton dissociation at the heterointerface and enhanced optical absorption enables extremely high photoconductive gain, resulting in UV photoresponsivity of ∼10 A/W. Interestingly, due to the electron-hole recombination process at the heterointerface, the response time can be modulated by the gate voltage. More importantly, the use of all-carbon hybrid materials ensures robust operation and further allows the demonstration of an exemplary 5 × 5 (2-dimensional) photodetector array. The devices exhibit negligible degradation in figures of merit even after 2 month of operation, indicating excellent environmental robustness. The combination of high responsivity, reliability, and scalable processability makes this new all-carbon film a promising candidate for future integrable optoelectronics.
由于石墨烯具有宽吸收带和高载流子迁移率，因此已被广泛研究用于高性能光电探测器。虽然石墨烯在紫外波段表现出极强的吸收能力，但要制造出具有长期稳定性的大规模可集成石墨烯基紫外光电探测器已被证明是一项挑战。在此，我们以石墨烯为碳组装模板，合成了一种具有固有强且可调紫外吸收的大规模全碳混合薄膜。异质界面处高效的激子解离和增强的光吸收实现了极高的光电导增益，从而产生了约10 A/W的紫外光响应度。有趣的是，由于异质界面处的电子-空穴复合过程，响应时间可通过栅极电压进行调制。更重要的是，全碳混合材料的使用确保了器件的稳健运行，并进一步实现了一个示例性的5×5（二维）光电探测器阵列的演示。即使经过两个月的运行，这些器件的品质因数下降也可忽略不计，表明其具有出色的环境稳健性。高响应度、可靠性和可扩展加工性的结合使这种新型全碳薄膜成为未来可集成光电子学的一个有前景的候选材料。
