Optical absorption in quantum dot systems on single crystal TiO2
| Project/Area Number |
17K04988
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Nanomaterials chemistry
|
|---|
| Research Institution | The University of Electro-Communications |
|---|
Principal Investigator |
Toyoda Taro 電気通信大学, その他部局等, 名誉教授 (40217576)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
沈 青 電気通信大学, 大学院情報理工学研究科, 教授 (50282926)
|
|---|
| Project Period (FY) |
2017-04-01 – 2023-03-31
|
| Project Status |
Completed (Fiscal Year 2022)
|
| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
|
|---|
| Keywords | 半導体量子ドット / 酸化チタン / 硫化鉛 / 光音響分光法 / 光電子収量分光法 / 無輻射緩和 / 自由エネルギー / イオン化エネルギー / 酸化チタン単結晶 / 光音響分光 / 光電子収量分光 / 有機系配位子 / セレン化カドミウム / 無輻射緩和過程 / 光誘起電子移動 / 増感機能 / 基板結晶面方位 |
|---|
| Outline of Final Research Achievements |
Semiconductor quantum-dots (QD) have desirable characteristics for solar-cells. Despite the potential advantages, no major advance in the in the efficiency of QD-sensitized solar cells has yet been reported. The present study focuses on attention to the exponential optical absorption edge (Urbach-tail) in QD-ligand systems with different QD spacing adsorbed on rutile-TiO2 substrates with different crystal orientations. Photoacoustic (PA) and absorbance (Abs) spectroscopies were applied to determine the optical absorption and nonradiative relaxation properties. There is a discrepancy between the PA and Abs spectra in the Urbach-tail region. Characterization of the Urbach-tail and heat generated by nonradiative relaxation of QD-ligand systems by PA and Abs spectroscopies showed that the characteristics depend on strongly on the crystal orientations of the rutile-TiO2 substrate, the QD spacing, and the free energy change.
|
| Academic Significance and Societal Importance of the Research Achievements |
QD太陽電池は、安価で高い変換効率の可能性を有する次世代候補として多くの研究が進行している。しかし未だ理論値には到達してはいない、本研究では、光誘起電子移動に伴う光エネルギー緩和、特に変換効率低下の要因（入射光エネルギー損失）となる吸着QD/基板ヘテロ界面における無輻射緩和を解明して変換効率向上に繋げる。現在無輻射緩和は重要な因子であるにも拘わらず十分には解明出来ていない。本研究の特長として、無輻射緩和評価として通常の吸光度(Abs)法に加え光音響(PA)法を同時適用する。同時適用することにより、無輻射緩和に伴う熱発生を正確に評価することを可能とし、無輻射緩和の本質的評価を可能とした。
|
Report
(7 results)
Research Products
(50 results)
-
-
-
-
-
-
[Journal Article] Trioctylphosphine oxide acts as alkahest for SnX2/PbX2: A general synthetic route to perovskite ASn(x)Pb(1-x)X(3) (A=Cs, FA, MA; x=Cl, Br, I) quantum dots2020
Author(s)
F.Liu, Y.Zhang, C.Ding, K.Kawabata, Y.Yoshihara, T.Toyoda, S.Hayase, T.Minemoto, R.Wang, Q.Shen
-
Journal Title
Chemistry of Materials
Volume: 32
Pages: 1089-1100
Related Report
Peer Reviewed / Int'l Joint Research
-
[Journal Article] Trioctylphosphin Oxide Acts as Alkahest for SnX2/PbX2: A General Synthetic Poute to Perovskite ASnxPb1-xX3 (A=Cs,FA,MA; X=Cl,Br,I) Quantum Dots2020
Author(s)
F.Liu, Y.Zhang, C.Ding, K.Kawabata, Y.Yoshihara, T.Toyoda, S.Hayase, R.Wang, Q.Shen
-
Journal Title
Chemistry of Materials
Volume: 32
Pages: 1089-1100
Related Report
-
[Journal Article] The interparticle distance limit for multiple exciton dissociation in PbS quantum dot solid films2019
Author(s)
N.Nakazawa, Y.Zhang, F.Liu, C.Ding, K.Hori, T.Toyoda, Y.Yao, Y.Zhou, S.Hayase, R.Wang, ZZou, Q. Shen
-
Journal Title
Nanoscale Horizons
Volume: 4
Pages: 445-451
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
-
-
-
-
[Journal Article] Lead selenide colloidal quantum dot solar cells achieving high open-circuit voltage with one-step deposition strategy2018
Author(s)
Y.Zhang, G.Wu, C.Ding, F.Liu, Y.Yao, Y.Zhou, C.Wu, N.Nakazawa, Q.Huang, T.Toyoda, R.Wang, S.Hayase, Z.Zou, Q.Shen
-
Journal Title
The Journal of Physical Chemistry Letters
Volume: 9
Pages: 3598-3603
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
-
-
-
[Journal Article] Improvement of photovoltaic performance of colloidal quantum dot solar cells using organic small molecule as hole-selective layer2017
Author(s)
Y.Zhang, G.Wu, I.Mora-Sero, C.Ding, F.Liu, Q.Huang, Y.Ogomi, S.Hayase, T.Toyoda, R.Wang, J.Otsuki, Q.Shen
-
Journal Title
The Journal of Physical Chemisty Letters
Volume: 8
Pages: 2163-2169
NAID
Related Report
Peer Reviewed / Int'l Joint Research
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
