Development of the non-destructive and 3-dimentional profile investigation of the non-radiative recombination in the nano-structure inserted solar cells

• Project/Area Number: 16H04648
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Energy engineering
• Research Institution: University of Miyazaki
• Principal Investigator: Fukuyama Atsuhiko 宮崎大学, 工学部, 教授 (10264368)
• Project Period (FY): 2016-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000); Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2016: ¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
• Keywords: 非発光再結合過程 / 超高効率量子ナノ太陽電池 / 非破壊且つ非接触評価技術 / レーザーヘテロダイン検出 / 非発光再結合 / 表面変位量測定 / ヘテロダイン干渉系 / 熱損失マッピング / 非破壊三次元評価 / 量子ドット / 量子井戸 / 太陽電池 / 量子ナノ構造 / 熱電素子 / 熱損失 / 非破壊非接触評価 / 非発光再結合検出 / ヘテロダイン表面変位検出 / 非破壊非接触評価法 / ヘテロダイン型干渉系 / 光熱変換分光 / 量子ナノ構造太陽電池 / モノダイン型干渉系

Outline of Final Research Achievements

The role of a GaAs strain-relaxation interlayer inserted into InGaAs/GaAsP superlattice solar cells was evaluated by measuring the piezo-electric photothermal (PPT) signals. The PPT signals caused by the non-radiative recombination of electrons photo-excited to the first quantized level were observed. The temperature-dependent PPT signal intensities were assessed using an electron carrier relaxation model. Although the non-radiative recombination remained dominant around room temperature, tunneling of carriers through the e2-miniband after thermal excitation from the e1-level increased and became comparable. This implies that the recombination loss of the photo-excited carriers is suppressed by the insertion of the GaAs interlayer.
Laser heterodyne photothermal displacement method was developed and adopted to n-type Si. Obtained surface displacements well corresponded to the theoretical calculation results based on the thermal diffusion equation.

Academic Significance and Societal Importance of the Research Achievements

量子ナノ太陽電池で十分な変換効率が得られていない理由は光吸収層に挿入する量子井戸や量子ドット、超格子構造の物性評価が不十分なためである。これら量子ナノ構造はLEDやLDなど発光デバイスに既に実装されているが、注入キャリアの発光再結合のみに注目したものである。一方、太陽電池では量子ナノ構造内に発生した光励起キャリアの再結合を抑制しつつ数十層もの量子ナノ構造中を輸送させるという非常に複雑なデバイス動作が必要であり、得られた成果は学術的にも非常に興味深い。また、非発光再結合に伴う表面変位量を非接触且つサブナノオーダーで高感度検出できる手法の確立は、様々な学術分野に応用できるポテンシャルを持つ。

Research Products

• [Journal Article] Reduction of non-radiative recombination by inserting a GaAs strain-relaxation interlayer in InGaAs/GaAsP superlattice solar cells investigated by photo-thermal spectroscopy (2020)
  • Author(s): Watanabe, A., Ikari, T., Furukawa, R., Sugiyama, M., Fukuyama, A.
  • Journal Title: Journal of Applied Physics Volume: 128 Issue: 19 Pages: 195702-195702
  • DOI: 10.1063/5.0031364
  • Peer Reviewed
• [Journal Article] Decreasing of the thermal conductivity of Si nanopillar/SiGe composite films investigated by using a piezoelectric photothermal spectroscopy (2020)
  • Author(s): Tomoki Harada, Tsubasa Aki, Daisuke Ohori, Seiji Samukawa, Tetsuo Ikari, and Atsuhiko Fukuyama
  • Journal Title: Japanese Journal of Applied Physics Volume: 59 Issue: SK Pages: SKKA08-SKKA08
  • DOI: 10.35848/1347-4065/ab82a6
  • Peer Reviewed
• [Journal Article] Theoretical study on the photothermal signal of the multilayer structure and application to the Si-nanopillar/SiGe composite films (2020)
  • Author(s): Y. Arata, T. Harada, D. Ohori, S. Samukawa, T. Ikari, A. Fukuyama
  • Journal Title: Proceedings of Symposium on Ultrasonic Electronics Volume: 41
• [Journal Article] Estimating Thermal and Optical Properties of Si-Nanopillar/SiGe Composite Film by a Piezoelectric Photothermal Measurements (2020)
  • Author(s): T. Harada, Y. Arata, D. Ohori, S. Samukawa, T. Ikari, A. Fukuyama
  • Journal Title: Proceedings of the 17th Int. Conf. on Flow Dynamics Volume: 17
• [Journal Article] Analysis and Estimation of Thermal Conductivity of Si Nanopillar/SiGe Composite Film by Using Photo-Thermal Spectroscopy Measurement with a Multi-layer Model Calculation (2019)
  • Author(s): T. Harada, T. Aki, D. Ohori, S. Samukawa, T. Ikari and A. Fukuyama
  • Journal Title: Proceedings of Symposium on Ultrasonic Electronics Volume: 40
• [Journal Article] Significant Reduction of Thermal Conductivity of Si Nanopillar/SiGe Composite Film Fabricated by Neutral Beam Etching Investigated by a Piezoelectric Photothermal Measurements (2019)
  • Author(s): T. Harada, T. Aki, D. Ohori, S. Samukawa, T. Ikari, A. Fukuyama
  • Journal Title: Proceedings of the 19th Int. Sympo. on Advanced Fluid Information Volume: 19 Pages: 24-25
• [Journal Article] Effect of strain relaxation layer insertion on carrier recombination and escaping process in superlattice solar cell structures using photoluminescence spectroscopy (2019)
  • Author(s): T. Nakamura, A. Fukuyama, M. Sugiyama, T. Ikari
  • Journal Title: Journal of Physics D: Applied Physics Volume: 52 Issue: 4 Pages: 045104-045104
  • DOI: 10.1088/1361-6463/aaeecd
  • Peer Reviewed
• [Presentation] シリコンナノピラーの間隔変化による熱特性への影響 (2020)
  • Author(s): 原田知季，安良田裕基，大堀大介，寒川誠二，碇哲雄，福山敦彦
  • Organizer: 令和2年秋季 第81回応用物理学会学術講演会
• [Presentation] フォトルミネッセンス分光法を用いた歪緩和層挿入超格子太陽電池における正孔輸送に関する解析 (2020)
  • Author(s): 渡部愛理，古川諒，杉山正和，碇哲雄，福山敦彦
  • Organizer: 令和2年秋季 第81回応用物理学会学術講演会
• [Presentation] PPT法による歪緩和層挿入超格子太陽電池におけるキャリア輸送特性へ正孔が与える影響 (2020)
  • Author(s): 古川諒, 渡部愛理, 杉山正和, 碇哲雄, 福山敦彦
  • Organizer: 令和2年秋季 第81回応用物理学会学術講演会
• [Presentation] 障壁層高さを変化させた歪緩和層挿入超格子太陽電池のキャリア輸送特性評価 (2020)
  • Author(s): 古川諒, 渡部愛理, 杉山正和, 碇哲雄, 福山敦彦
  • Organizer: 第17回「次世代の太陽光発電システム」シンポジウム
• [Presentation] Estimating Thermal and Optical Properties of Si-Nanopillar/SiGe Composite Film by a Piezoelectric Photothermal Measurements (2020)
  • Author(s): T. Harada, Y. Arata, D. Ohori, S. Samukawa, T. Ikari, A. Fukuyama
  • Organizer: 17th Int. Conference on Flow Dynamics
  • Int'l Joint Research
• [Presentation] Theoretical study on the photothermal signal of the multilayer structure and application to the Si-nanopillar/SiGe composite films (2020)
  • Author(s): Y. Arata, T. Harada, D. Ohori, S. Samukawa, T. Ikari, A. Fukuyama
  • Organizer: 第41回超音波エレクトロニクスの基礎と応用に関するシンポジウム
• [Presentation] Significant Reduction of Thermal Conductivity of Si Nanopillar/SiGe Composite Film Fabricated by Neutral Beam Etching Investigated by a Piezoelectric Photothermal Measurements (2019)
  • Author(s): T. Harada, T. Aki, D. Ohori, S. Samukawa, T. Ikari, A. Fukuyama
  • Organizer: The 19th Int. Symposium on Advanced Fluid Information
  • Int'l Joint Research
• [Presentation] Analysis and Estimation of Thermal Conductivity of Si Nanopillar/SiGe Composite Film by Using Photo-Thermal Spectroscopy Measurement with a Multi-layer Model Calculation (2019)
  • Author(s): T. Harada, T. Aki, D. Ohori, S. Samukawa, T. Ikari and A. Fukuyama
  • Organizer: 第40回超音波エレクトロニクスの基礎と応用に関するシンポジウム
• [Presentation] 光熱変換信号の周波数依存性測定によるSiナノピラー/SiGe複合膜の熱伝導率解析 (2019)
  • Author(s): 安良田裕基, 原田知季, 安藝 翼, 大堀大介, 寒川誠二, 碇哲雄, 福山敦彦
  • Organizer: 第11回半導体材料・デバイスフォーラム
• [Presentation] Effect of Light Irradiation on Carrier Mobility of n- and p-type Si substrates for Solar Cell Application (2018)
  • Author(s): A. Fukuyama, S. Tategami, K. Takauchi, N. Matsuda, T. Nakamura, H. Suzuki, K. Nishioka, and T. Ikari
  • Organizer: 7th World Conference on Photovoltaic Energy Conversion (WCPEC-7)
  • Int'l Joint Research
• [Presentation] 集光照射によるGaAsのHall移動度変化と太陽電池特性への影響 (2018)
  • Author(s): 高内健二郎, 松田真輝, 西岡賢祐, 碇哲雄, 福山敦彦
  • Organizer: 第15回「次世代の太陽光発電システム」シンポジウム (学振175シンポ)
• [Presentation] 歪緩和層を挿入した超格子太陽電池のキャリア輸送メカニズム (2018)
  • Author(s): 魯家男, 中村翼, 鈴木秀俊, 碇哲雄, 杉山正和, 福山敦彦
  • Organizer: 第15回「次世代の太陽光発電システム」シンポジウム (学振175シンポ)
• [Presentation] Verification of Stark-ladder formation in InGaAs/GaAsP superlattice solar cell structures by a photo-reflectance (2018)
  • Author(s): T. Ikari, T. Nakamura, M. Sugiyama, A. Fukuyama
  • Organizer: Int. Conference on the Physics of Semiconductors (ICPS2018)
  • Int'l Joint Research
• [Presentation] Role of GaAs interlayer between quantum well and barrier layers in carrier thermal escaping transport process in InGaAs/GaAsP superlattice solar cells (2018)
  • Author(s): T. Nakamura, T. Ikari, M. Sugiyama, A. Fukuyama
  • Organizer: Int. Conference on the Physics of Semiconductors (ICPS2018)
  • Int'l Joint Research
• [Presentation] Temperature dependence of carrier relaxation process in InGaAs/GaAsP superlattice solar cell with GaAs interlayer (2018)
  • Author(s): R. Iwanaga, T. Nakamura, J. Lu, T. Ikari, M. Sugiyama, and A. Fukuyama
  • Organizer: 第37回電子材料シンポジウム(EMS37)
• [Presentation] 光照射下のp-Si基板における光励起キャリア濃度の非線形的な増加とキャリアライフタイムの関係 (2018)
  • Author(s): 高内健二郎, 碇哲雄, 西岡賢祐, 福山敦彦
  • Organizer: 平成30年度応用物理学会九州支部学術講演会
• [Presentation] 集光照射下でのSi基板のHall移動度の温度依存性 (2018)
  • Author(s): 髙内健二郎、碇哲雄、西岡賢祐、福山敦彦
  • Organizer: 第3回フロンティア太陽電池セミナー
• [Presentation] Excitons in InGaAs/GaAsP multi quantum well and super lattice solar cell structures investigated by a photothermal spectroscopy (2017)
  • Author(s): T. Ikari, K. Matsuochi, T. Nakamura, H. Takeda, H. Suzuki, K. Toprasertpong, M. Sugiyama, Y. Nakano and A. Fukuyama
  • Organizer: The European Materials Research Society Spring Meeting 2017
  • Int'l Joint Research
• [Presentation] Effect of barrier thickness on formation of miniband in InGaAs/GaAsP superlattice structure for solar cells application (2017)
  • Author(s): T. Nakamura, K. Matsuochi, H. Takeda, H. Suzuki, T. Ikari, K. Toprasertpong, M. Sugiyama, Y. Nakano and A. Fukuyama
  • Organizer: The European Materials Research Society Spring Meeting 2017
  • Int'l Joint Research
• [Presentation] 歪緩和層を挿入した超格子太陽電池のキャリア輸送評価 (2017)
  • Author(s): 魯家男, 武田秀明, 中村翼, 鈴木秀俊,碇哲雄, K. Toprasertpong, 杉山正和, 中野義昭, 福山敦彦
  • Organizer: 第14回「次世代の太陽光発電システム」シンポジウム
• [Presentation] Investigation of Carrier Thermal Excitation Process in GaAs-Inserted InGaAs/GaAsP Superlattice Solar Cell (2017)
  • Author(s): T. Nakamura, H. Takeda, J. Lu, H. Suzuki, T. Ikari, K. Topraserpong, M. Sugiyama, and A. Fukuyama
  • Organizer: 第36回電子材料シンポジウム
• [Presentation] Investigation of carrier transport mechanism in superlattice Solar Cells with strain relaxation layer (2017)
  • Author(s): H. Takeda, T. Nakamura, J. Lu, H. Suzuki, K. Toprasertpong, M. Sugiyama, T. Ikari, A. Fukuyama
  • Organizer: 27th International Photovoltaic Science and Engineering Conference and Exhibition
  • Int'l Joint Research
• [Presentation] フラットバンド構造内に挿入された超格子におけるミニバンド形成過程とキャリア輸送評価 (2016)
  • Author(s): 中村 翼, 松落 高輝, 武田 秀明, Kasidit Toprasertpong, 杉山 正和, 中野 義昭, 鈴木 秀俊, 碇 哲雄, 福山 敦彦
  • Organizer: 2016年度レーザー・量子エレクトロニクス研究会
  • Place of Presentation: 宮崎市民プラザ（宮崎）
• [Presentation] 光熱変換法による InGaAs/GaAsP 超格子に形成されるミニバンド端エネルギーの測定 (2016)
  • Author(s): 碇 哲雄, 福山 敦彦, 中村 翼, 杉山 正和, 中野 義昭
  • Organizer: 第37回超音波エレクトロニクスの基礎と応用に関するシンポジウム
  • Place of Presentation: Pukyong National Univ.（Pusan, Korea）
  • Int'l Joint Research