Ti Foil-based Flexible Dye-sensitized Solar Cells: Photophysical and Photoelectrochemical Studies

以鈦板為可撓基材之染料敏化太陽能電池：光物理和光電化學研究

林律吟(Lu-Yin Lin)

《光學工程》 121期 (2013/04) Pp. 1-7

摘要

本論文分為三大部分，主要探討以鈦版為光電極基材之可撓式背面照光染料敏化太陽能電池。第一部分為改善此系統之元件效能及增加其長期穩定性之基礎探討。第二部分為針對此系統主要缺點提出解決方法。其一由於鈦板基材不透光的特性，太陽光必須由白金對電極入射，以致此系統之入射光強度比起一般正照式染料敏化太陽能電池低，導致激發染料電子量下降並減少光電流產生。有鑑於此，為了有效提高經由背面入射光之強度，本研究提出具有網狀結構之白金對電極增加此系統之背面入射光強度。在白金濺鍍電流40 mA及濺鍍時間5 s條件下，網狀白金對電極具有高達99%之穿透度，高於一般非網狀白金對電極92%之穿透度。即便是網狀白金對電極對於電解液之氧化還原對催化能力稍不及一般非網狀白金對電極，但其高穿透度之優點使其組成之元件擁有較優良之效能表現，其光電轉換效率可達4.77%。第三部分中，本研究引入具有高傳導電子速度之二氧化鈦奈米管於光電極，來彌補傳統二氧化鈦奈米粒子於粒子間眾多晶界而造成之低傳導電子速率。另外對於可撓式染料敏化太陽能電池，不僅是如前幾章提到的可撓式光電極重要，可撓式對電極也是不可或缺的要素。本研究中最後一章節利用具有二氧化鈦奈米管印記之鈦板作為對電極基材，此二氧化鈦奈米管印記於超音波震盪移除鈦板上之二氧化鈦奈米管後形成於鈦板上。

關鍵字

背面照光 ； 染料敏化太陽能電池 ； 可撓 ； 鈦板 ； 二氧化鈦奈米管

並列摘要

There are three parts in this dissertation, aiming to investigate the Ti foil-based photoanodes for back-illuminated dye-sensitized solar cells (DSSCs). In the first part, the fundamental researches regarding this system were made to improve the cell performance and the durability. In the second part, strategies to solve the challenges in this system are proposed. Net-like Pt counter electrodes were made to increase the incident light illuminated from the back side of the cell. Higher transmittance of an average value of 99% was obtained for net-like Pt counter electrodes, with compared to that of 92% for a bare one, under Pt sputtering current of 40 mA for 5 s. Even the catalytic ability of the Pt layer is worse for net-like Pt counter electrodes caused by less Pt deposition, their higher transmittances lead to the better performance for the pertinent DSSC (η= 4.77%). Other than applying TiO2 nanoparticles (TNPs) as the semiconductor layer for the studies mentioned above, the other structure with higher electron transferring rate was introduced in the last part to compensate for the lower electron transportation in TNPs caused by numerous boundaries between TNPs. One-dimensional TiO2 nanotubes (TNTs) were widely used in the recent years because it exhibits better electron transportation and can reduce the loss of electrons by recombination. On the other hand, for a flexible DSSC, not only a flexible photoanode but a flexible counter electrode is indispensable. Traditionally, the Ti foils are anodized for making TNTs and applied in a photoanode. However, in the last chapter in the last part, the imprints of TNTs were utilized by first fabricating TNTs on Ti foils by anodization and removing TNTs completely from Ti foils by ultrasonically vibration.

並列關鍵字

Back illumination ； Dye-sensitized solar cells ； Flexible ； Titanium foil ； TiO2 nanotubes