李孝峰组近期在APL(IF3.515)发表3篇论文
论文一
标题：Carrier depletion andelectrical optimization of gallium arsenide plasmonic solar cell with a rearmetallic grating
作者：Aixue Shang and Xiaofeng Li*
论文摘要：
Plasmonic nanostructures have been extensivelyconsidered for photovoltaics due to the outstanding light-trapping capability;however, the intrinsic processes of carrier transport, recombination andcollection have seldom been concerned. We report a complete optoelectronicinvestigation for plasmonic gallium arsenide solar cells (SCs) with a rearsilver grating, by especially quantifying the plasmonics-induced photocurrentloss. It is found that, although the plasmonic design shows indeed muchimproved output photocurrent, its potential in improving the performance of SCshas not been fully exploited since a lot of energy has been wasted in the formof carrier depletion. A further design which electrically separates theplasmonic nanostructure from the core PN junction is verified to be aneffective solution in improving the electrical performance of the SCs. Thecomplete optoelectronic consideration is expected to advance the design ofplasmonic SCs for thin-film and high-efficiency.

原文链接：http://scitation.aip.org/content/aip/journal/apl/106/5/10.1063/1.4907545

论文二
标题：Limiting efficiency calculation of silicon single-nanowire solar cells with considering Auger recombination
作者：Xiongfei Zhai, Shaolong Wu, Aixue Shang, and Xiaofeng Li*
论文摘要：
Single-nanowire solar cells (SNSCs) have attractedconsiderable attention due to their unique light-harvesting capability mediatedby the optical antenna effect and the high photoconversion efficiency due tothe orthogonalization of the carrier collection to the photon incidence. Wepresent a detailed prediction of the light-conversion efficiency of Si SNSCsbased on finite-element simulation and thermodynamic balance analysis, withespecially focusing on the comparison between SNSCs and film systems. Carrierlosses due to radiative and Auger recombinations are introduced in the analysisof the limiting efficiency, which show that the Auger recombination plays a keyrole in accurately predicting the efficiency of Si SNSCs, otherwise, the deviceperformance would be strongly overestimated. The study paves a more realisticway to evaluate the nanostructured solar cells based on indirect-bandphotoactive materials.

原文链接：http://scitation.aip.org/content/aip/journal/apl/106/6/10.1063/1.4908294

论文三
标题：Coaxial Ag/ZnO/Ag nanowire for highly sensitive hot-electron photodetection
作者：Yaohui Zhan, Xiaofeng Li*, Kai Wu, Shaolong Wu, and Jiajia Deng
论文摘要：
Single-nanowire photodetectors (SNPDs) are mostlypropelled by p-n junctions, where the detection wavelength is constrained bythe band-gap width. Here, we present a simple doping-freemetal/semiconductor/metal SNPD, which shows strong detection tunability withoutsuch a material constraint. The proposed hot-electron SNPD exhibits superioroptical and electrical advantages, i.e., optically the coaxial design leads toa strong asymmetrical photoabsorption and results in a high unidirectional photocurrent,as desired by the hot-electron collection; electrically the hot-electrons aregenerated in the region very close to the barrier, facilitating the electricaltransport. Rigorous calculations predict an unbiased photoresponsivity of ∼200 nA/mW.

原文链接：ttp://scitation.aip.org/content/aip/journal/apl/106/8/10.1063/1.4913613