Toward efficient and omnidirectional n-type si solar cells: Concurrent improvement in optical and electrical characteristics by employing microscale hierarchical structures

Hsin Ping Wang, Tzu Yin Lin, Meng Lin Tsai, Wei Chen Tu, Ming Yi Huang, Chee Wee Liu, Yu Lun Chueh, Jr Hau He

研究成果: Article同行評審

46 引文 斯高帕斯(Scopus)

摘要

We demonstrated that hierarchical structures combining different scales (i.e., pyramids from 1.5 to 7.5 μm in width on grooves from 40 to 50 μm in diameter) exhibit excellent broadband and omnidirectional light-trapping characteristics. These microscaled hierarchical structures could not only improve light absorption but prevent poor electrical properties typically observed from nanostructures (e.g., ultra-high-density surface defects and nonconformal deposition of following layers, causing low open-circuit voltages and fill factors). The microscaled hierarchical Si heterojunction solar cells fabricated with hydrogenated amorphous Si layers on as-cut Czochralski n-type substrates show a high short-circuit current density of 36.4 mA/cm2, an open-circuit voltage of 607 mV, and a conversion efficiency of 15.2% due to excellent antireflection and light-scattering characteristics without sacrificing minority carrier lifetimes. Compared to cells with grooved structures, hierarchical heterojunction solar cells exhibit a daily power density enhancement (69%) much higher than the power density enhancement at normal angle of incidence (49%), demonstrating omnidirectional photovoltaic characteristics of hierarchical structures. Such a concept of hierarchical structures simultaneously improving light absorption and photocarrier collection efficiency opens avenues for developing large-area and cost-effective solar energy devices in the industry.

原文English
頁(從 - 到)2959-2969
頁數11
期刊ACS nano
8
發行號3
DOIs
出版狀態Published - 2014 三月 25

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 工程 (全部)
  • 物理與天文學 (全部)

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