成果報告書詳細
管理番号20160000000338
タイトル*平成27年度中間年報 エネルギー・環境新技術先導プログラム 低炭素社会構築に向けたオフグリッドエネルギーハーベストデバイスの開発
公開日2016/6/22
報告書年度2015 - 2015
委託先名国立大学法人東京大学先端科学技術研究センター ビフレステック株式会社 株式会社リコー
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約Title: Advanced Research Program for Energy and Environmental Technologies / Development of Off-Grid Energy-Harvest Device toward a Low-Carbon Society (FY2014-FY2016) FY2015 Annual Report

This project aims to develop next-generation high-performance energy-supply devices by the combination of solar cells and secondary-batteries/capacitors, which, compared to the existing technologies, exhibit twice higher performance and seven times larger capacity, respectively. The project includes three subjects: A. enhancement of functionalities of organic solar cells, B. development of high-performance secondary batteries and capacitors, C. development of devices using all-solid state dye-sensitized solar cells, and D. consideration toward the realization of national projects. Results obtained for four of them are summarized. In the subject A, we developed PbS quantum dots (QDs)-based solar cells with ZnO nanowires to double external quantum efficiency (EQE) in the near infrared (NIR) region. A novel transparent conductive oxide (Ta-doped SnO2; TTO) with a high transmittance of about 80% in the NIR was then employed. PbS QD-based solar cells were fabricated by using QDs with an exciton peak of 1300 nm and TTO substrates. The TTO-based cell achieved a high EQE value of 38% at the peak, which is almost twice as high as an EQE of 20% obtained on the cell formed with a conventional F-doped SnO2 substrate. For the improvement of the performance of photo-rechargeable solar cells, we designed the electrode patterns for photo-rechargeable solar cells. Unlike a widely-used screen printing method, photolithography technique was found to be more suitable to develop the electrode with the fine pattern of charge storage and solar power generation regions. In the subject B, design and application of high-performance secondary batteries and capacitors, we constructed prototype rechargeable batteries working with a new anode reaction involving Li2O2 and LiO2. The battery fabricated with a Li metal cathode showed a capacity of 250 mAh/g. In the subject C, we have developed all-solid-state dye-sensitized solar cells, which are highly efficient under an indoor lighting condition, with the aim of achieving small-sized flexible solar cells for IoT applications. We constructed all-solid-state DSSCs with the size of 34 cm2, which can generate over 10 microwatt/cm2 electricity (200 lux white LED). All-solid-state flexible DSSCs were also fabricated using metal foil substrates and PEDOT:PSS-based conductive window layers. The DSSC with the size of 0.18 cm2 achieved over 6.5 microwatt/cm2, which is as high as that of a-Si solar cells. We also constructed DSSC modules (25mm X 53mm) composed of 8 sub-cells connected in series, and succeeded in charging a rechargeable battery through a small-sized voltage boost converter under the illumination of 500-lux white LED. In the subject D, we organized lectures on light harvesting devices and their potential and/or possible applications several times to discuss and cultivate new ideas for IoT related devices based on organic photovoltaics.
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