yrammuS 要概髙橋 幸奈64Yukina TAKAHASHI吉田 慎哉65Shinya YOSHIDA新型プラズモン誘起電荷分離システムを利用した全固体光電変換セルの開発（2018採択）Development of solid state photovoltaic cells based on novel plasmon-induced charge separation system(Project 2018)超高性能圧電微小超音波イメージャによって実現する小型・高セキュア複合生体認証システム(2019採択)Small and Highly-Secure Multimodal Biometric System Realized by Ultrahigh-Performance Piezoelectric Micromachined Ultrasonic Imager (Project 2019)55Rep. Grant. Res., Asahi Glass Foundation (2022)with dramatically higher responsiveness than suction. In this study, an actual device based on the proposed princi-ple was fabricated, and the validity of the principle was confirmed through experiments on the actual device.可視光応答型光触媒や光電変換セルなど，各種の光エネルギー変換デバイスへと応用できるプラズモン誘起電荷分離(PICS)システムは，従来，金や銀などの貴金属ナノ粒子と酸化チタンなどのn型半導体との組み合わせでのみ可能であった．本課題では，n型半導体を用いていた従来系とは異なり，p型半導体と金属ナノ粒子を組み合わせた新型PICSシステムを実現した．ホール輸送層も電子輸送層も用いずに，p型半導体と金属ナノ粒子からなる全固体光電変換セルの作製に成功し，現時点における新型PICSシステムの最高効率を達成した．Plasmon-induced charge separation (PICS) systems, which can be applied to various photoenergy conversion devices such as visible light responsive photocatalysts and photoelectric conversion cells, were previously possible only by employing n-type semiconductors such as titanium oxide combining with noble metal nano-particles, such as gold and silver nanoparticles. In this project, a new type of PICS system was realized by combining p-type semiconductors and metal nanoparticles, unlike the conventional system that used n-type semiconductors. All-solid-state photoelectric conversion cells consisting of p-type semiconductors and metal nanoparticles were successfully fabricated without using any hole or electron transport layers, and the highest efficiency of the new PICS system has been achieved in the world.近年，生体認証の重要性が急激に増しており，安全かつ便利な生体認証システムが求められている．本研究では，次世代の生体認証システムの一つとして，指紋と動静脈情報を撮像できる圧電微小超音波トランスデューサ（pMUT）を開発する．この実現に向けた課題の一つは，従来のpMUTでは，皮下に存在する動静脈パターンを，高い解像度で取得することが難しい点にある．本研究では，高い性能指数を誇るチタン酸ジルコン酸鉛単結晶薄膜を用いてデバイスを高性能化することで，課題解決を目指す．本助成において，血管の超音波撮像の可能性の検討，デバイス構造の最適化と試作，二次元アレイの試作などを行い，システム化に向けた基盤技術を開発した．In recent years, the importance of biometric authentication has been rapidly increasing, and secure and con-venient biometric authentication systems are required. In this study, we develop a piezoelectric microma-chined ultrasonic transducer (pMUT) that can image fingerprint and vessel information as one of the next generation biometric authentication systems. One of the challenges in realizing this system is that it is diffi-cult for conventional pMUTs to acquire vessel patterns under the skin with high resolution. In this study, we aim to solve this problem by improving the performance of the device using a single-crystal thin film of lead zirconate titanate with a high performance index. In this grant, the feasibility of ultrasonic imaging of blood vessels was investigated, the device structure was optimized and prototyped, and a two-dimensional array was fabricated. As a result, the basic technology for systemization was developed..
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