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20 December 2020, Volume 40 Issue 6 Previous Issue    Next Issue

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Progress and Challenges of Indoor Photovoltaics Yang Wen-Fan, Li Meng, Wang Zhao-Kui 2020, 40 (6):  175-187.  doi: 10.13725/j.cnki.pip.2020.06.001 PDF (3237KB) ( 2171 )   Along with the production and consumption of energy source, the indoor photovoltaics (IPV) gradually attracted public attention. As the power sources under low light conditions, IPV can satisfy the energy needs for some electron device with low power. This review focused and compared the characteristics of different types of IPV devices such as those based on silicon, dye, III-V semiconductors, organic compounds, and halide perovskites. Owing to optimal optical and physical properties, perovskite solar cells possess the potential to be IPV. Meanwhile, this review also concluded the limitations of IPV and gave the way to handle these key points such as power conversion efficiency (PCE)、toxicity and stability. Finally it expressed the prospects for IPVs Related Articles | Metrics

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A Method for Calculating the Time Required for DNA Looping Wang Yao-Lai , Zhao Di-Fan , Tang Qian-Yuan 2020, 40 (6):  188-193.  doi: 10.13725/j.cnki.pip.2020.06.002 PDF (3863KB) ( 600 )   The formation of a DNA loop takes a crucial role in transcriptional regulation, where the enhancer is tethered to its promoter. This step is a time-limiting step for activating transcriptional initiation. Here, We review a formula that is appropriate for computing the time required for formatting such a loop, or other DNA loops at the similar length scale where the looping can be attributed to a spontaneous decrease in conformation entropy. The formula shows that topological structure due to the orientation of two big grooves where a protein binds primarily determines whether two sites could be looped, and that the intervening DNA length denes the looping time. This method takes the advantages of bypassing the complexity of DNA structure and cellular circumstances, but requiring some parameters to be measured experimentally. Related Articles | Metrics

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Nonlinear Dynamics and Applications of Spin Hall Nano-Oscillators Liu Rong-Hua , Li Li-Yuan , Chen Li-Na , Zhou Kai-Yuan , Du You-Wei 2020, 40 (6):  189-210.  doi: 10.13725/j.cnki.pip.2020.06.003 PDF (3549KB) ( 1400 )   Spin Hall nano oscillator (SHNO), a new type spintronic nano-device, can generate microwave signal and excite coherent spin waves due to spin current-driven magnetization precession and have strong potential for applications from data storage，rf communication, microwave generation to neuromorphic computing. In this review, we focus on the complex nonlinear dynamic characteristics of spin-wave modes generated by SHNOs in the various ferromagnetic/nonmagnetic (FM/NM) bilayer systems with an extended free layer. Based on the abundantly previous experimental results obtained by combining microwave spectroscopy and micro-focused Brillouin light scattering techniques, as well as micromagnetic simulation, we detailedly describe and summarize the experimental parameters dependent magnetic dynamics of SHNOs with different device configurations and magnetic materials, such as in-plane nanogap-type, nanoconstriction-type, nanowire-type, vertical nanocontact-type SHNOs with in-plane or out-of-plane magnetization. Finally, we also discuss mutual synchronization of SHNO arrays and the potential applications in magnon-based logic devices with ultralow energy consumption and spin-based artificial neural network for neuromorphic computing in the field of artificial intelligence. Related Articles | Metrics