Interfacial Built-In Electric Field-Driven Direct Current Generator Based on Dynamic Silicon Homojunction
Yanghua Lu,
Qiuyue Gao,
Xutao Yu,
Haonan Zheng,
Runjiang Shen,
Zhenzhen Hao,
Yanfei Yan,
Panpan Zhang,
Yu Wen,
Guiting Yang,
Shisheng Lin
Affiliations
Yanghua Lu
College of Microelectronics, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
Qiuyue Gao
College of Microelectronics, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
Xutao Yu
College of Microelectronics, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
Haonan Zheng
College of Microelectronics, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
Runjiang Shen
College of Microelectronics, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
Zhenzhen Hao
College of Microelectronics, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
Yanfei Yan
College of Microelectronics, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
Panpan Zhang
College of Microelectronics, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
Yu Wen
Wuxi Branch of Jiangsu Province Special Equipment Safety Supervision and Inspection Institute, Wuxi 214071, China
Guiting Yang
State Key Laboratory of Space Power Technology, Shanghai Institute of Space Power Sources, Shanghai 200245, China
Shisheng Lin
College of Microelectronics, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China; State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
Searching for light and miniaturized functional device structures for sustainable energy gathering from the environment is the focus of energy society with the development of the internet of things. The proposal of a dynamic heterojunction-based direct current generator builds up new platforms for developing in situ energy. However, the requirement of different semiconductors in dynamic heterojunction is too complex to wide applications, generating energy loss for crystal structure mismatch. Herein, dynamic homojunction generators are explored, with the same semiconductor and majority carrier type. Systematic experiments reveal that the majority of carrier directional separation originates from the breaking symmetry between carrier distribution, leading to the rebounding effect of carriers by the interfacial electric field. Strikingly, NN Si homojunction with different Fermi levels can also output the electricity with higher current density than PP/PN homojunction, attributing to higher carrier mobility. The current density is as high as 214.0 A/m2, and internal impedance is as low as 3.6 kΩ, matching well with the impedance of electron components. Furthermore, the N-i-N structure is explored, whose output voltage can be further improved to 1.3 V in the case of the N-Si/Al2O3/N-Si structure, attributing to the enhanced interfacial barrier. This approach provides a simple and feasible way of converting low-frequency disordered mechanical motion into electricity.
