カーボンナノチューブ膜を用いた革新的ペロブスカイト型太陽電池開発

2017 Fiscal Year Annual Research Report

• Project/Area Number: 17F17364
• Research Institution: The University of Tokyo
• Principal Investigator: 丸山 茂夫 東京大学, 大学院工学系研究科(工学部), 教授 (90209700)
• Co-Investigator(Kenkyū-buntansha): GHAREEB AHMED 東京大学, 工学(系)研究科(研究院), 外国人特別研究員
• Project Period (FY): 2017-11-10 – 2020-03-31
• Keywords: Carbon nanotubes / CVD Synthesis / Doping / Hole transport / Electrode / Perovskite / Photovoltaics

Outline of Annual Research Achievements

This research is focus to growth and modification of carbon nanotubes having the ability to replace the metal electrode in perovskite-type solar cells. Hence, the cost of the device will be reduced since elimination of the vacuum processing of the fabrication. Up to now, the following points were achieved related to this work;Literature survey on recent progress on synthesis and application of single-wall carbon nanotubes in solar cells.
Fabrication of perovskite-type solar cells with gold electrode as a reference in ambient conditions having photoconversion efficiency of 14~16%.
Submission of a review article as a first author entitled ‘Recent Advances in Synthesis and Solar Cell applications of Single-Walled Carbon Nanotubes’ in the special issue organized on “Emerging Carbons” to Advanced Materials Journal. (IF 19.791, under review). Attended the 45th fullerene, nanotube, and graphene society General Symposium at the University of Tokyo on March 10-12, 2018. Submission of previous work done in perovskite solar cells with single-wall carbon nanotube electrodes as a co-author entitled ‘Non-Doped and Unsorted Single-Walled Carbon Nanotubes as Carrier-Selective, Transparent and Conductive Electrode for Perovskite Solar Cells’ to MRS Communication journal. (IF 3.01, under review).

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

Growth of nanocarbon-coated single-walled carbon nanotube films by CVD to enhance both mechanical and electrical properties reaching a sheet resistance of ~300 ohms per square.
Fabrication of reference perovskite solar cells in the normal structure with gold electrodes reaching a photoconversion efficiency of ~15% in the ambient conditions with two different photoactive materials, namely Methyl ammonium lead iodide and Formamidinium-Methyl ammonium lead iodide doped with Cesium (2D perovskite) structures. We are seeking now the full fabrication in ambient conditions to reach ~18%.
Obstacles; humidity is increasing due to the summer season in Japan that might affect the fabrication of humidity-sensitive perovskite structures in the ambient conditions. Therefore, we purchased a small glovebox for perovskite solution preparation and reducing the humidity during the preparation process.

Strategy for Future Research Activity

Optimization of growth conditions for nanocarbon-coated single-walled carbon nanotube films seeking lower sheet resistance.
Doping of single-walled carbon nanotube films.
Characterization of the prepared structures by different techniques.
Application of single-walled carbon nanotube films in the normal structure 2D perovskite type solar cells.
Presenting new results in national and/or international conferences.