Study of efficiency enhancement of Si solar cells based on quantum and photonic structure control

• Project/Area Number: 25249139
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Energy engineering
• Research Institution: The University of Tokyo
• Principal Investigator: Wada Kazumi 東京大学, 工学(系)研究科(研究院), 教授 (30376511)
• Co-Investigator(Kenkyū-buntansha): SAMUKAWA Seiji 東北大学, 流体化学研究所, 教授 (30323108)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥45,370,000 (Direct Cost: ¥34,900,000、Indirect Cost: ¥10,470,000); Fiscal Year 2015: ¥12,220,000 (Direct Cost: ¥9,400,000、Indirect Cost: ¥2,820,000); Fiscal Year 2014: ¥15,730,000 (Direct Cost: ¥12,100,000、Indirect Cost: ¥3,630,000); Fiscal Year 2013: ¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
• Keywords: 薄膜シリコン太陽電池 / 高効率化 / 面内光ガイディング / ナノシリコン球 / 共鳴散乱現象 / シリコン量子細線 / ゲルマニウム量子細線 / バイオテンプレート曲面加工 / ケルマニウム量子細線 / バイオテンプレート局面加工 / バイオテンプレート極限加工

Outline of Final Research Achievements

The present study consists of Photonic- and Quantum Nanostructure Control. The theme of Photonic Nanostructure Control demonstrates “lateral light guiding (LLG)” principle for thin Si solarcells based on resonant scattering of incident light by Si nano-spheres (SNS) of 300 nm in radius. The theme of Quantum Nanostructure Control demonstrates Ge quantum wire (Ge QWR) structures fabricated using Neutral beam Etching with Ferritin Biotemplates. The QWR is 10-20 nm in radius and 200 nm long, and shows a peak at 1300 nm in photoluminescence spectrum. The peak agrees well with the theoretical calculation.
These achievements are proof-of-concept of Si based- high-efficiency tandem cells with Ge-QWRs consisting of different radii and a LLG Si solarcell of only a few μm thick with SNS of 300-nm in radius underneath.

Research Products

• [Presentation] Resonance Scattering by Nanoparticales for Efficiency Enhancement of Thin Film Solarcells.
  • Author(s): Chen Zheng, Hiroaki Shindo, Jingnan Cai, Naoyuki. J. Kawai, Kazumi Wada
  • Organizer: Materials Research Society・応用物理学会合同シンポジウム
  • Place of Presentation: 同志社大学京田辺キャンパス､京都府
• [Presentation] バイオテンプレートを用いた中性粒子ビーム加工によるGeナノディスク作製
  • Author(s): モハマド エルマン，岡田 健，磯田大河，伊藤公平，山下一郎，寒川誠二
  • Organizer: 第61回 応用物理学会春季学術講演会
  • Place of Presentation: 青山学院大学相模原キャンパス､神奈川県