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Yang L.,CAS Institute of Physics | Yang L.,Chinese Academy of Sciences | Liu Y.,CAS Institute of Physics | Liu Y.,Chinese Academy of Sciences | And 14 more authors.
RSC Advances | Year: 2014

Optimization of a silicon pyramidal emitter by self-selective Ag-assisted chemical etching is explored with regard to solar cell applications. Increased sheet resistance and increased lifetime of the minority carriers together indicate that the emitter recombination is significantly reduced, as a result of minimizing the dead layer on the silicon surface. Scanning electron microscopy (SEM) images reveal that the peaked pyramid becomes rounded, alleviating the heavy phosphorus (P) diffusion at the peak of the pyramid. Moreover, the reflectivity of the silicon wafers increases a little after optimization due to the formation of the rounded pyramids, indicating that the emitter becomes more uniform as well. Such an optimization process will result in a minimized dead layer and uniform emitter, leading to decreased Auger recombination and enhanced efficiency of collecting electrons, which improves the open-circuit voltage (Voc), short-circuit current density (Jsc), conversion efficiency (Eff) and external quantum efficiency (EQE) of the solar cells significantly. © 2014 the Partner Organisations.

Zhang Q.,Beijing Flight Boda Electronics Ltd. | Li X.,Beijing Flight Boda Electronics Ltd. | Hua Y.,Beijing Flight Boda Electronics Ltd. | Yao Y.,Beijing Flight Boda Electronics Ltd. | And 2 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2016

This study investigated the influence of the rear structure for Al-alloyed rear emitter n-type mono-crystalline solar cell,and proposed polished rear structure as a new manufacturing technology for Al-alloyed rear emitter n-type mono-crystalline solar cell. Surface recombination velocities,microstructure,quantum efficiency and electric properties of the cells were characterized using lifetime monitor,scanning electron microscopy(SEM),quantum efficiency tester and solar cell measuring instrument,respectively. The results showed that the polished rear structure was better than the texture for Al-alloyed rear emitter n-type mono-crystalline solar cell. The polished structure reduced rear surface recombination velocity,improved the quality of p-n junction and the external quantum efficiency,resulting in an increase of the conversion efficiency by 0.34%. © 2016, Editorial Board of Acta Energiae Solaris Sinica. All right reserved.

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