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標題: | 微遲滯現象鈣鈦礦太陽能電池及應用於軟性電子元件 Fabrication of nearly hysteresis-free perovskite solar cells and its application in flexible electronics |
作者: | Jing-Rong Cheng 鄭靖融 |
指導教授: | 吳志毅(Chih-I Wu) |
關鍵字: | 鈣鈦礦太陽能電池,低溫製程,可撓性鈣鈦礦太陽能電池,二氧化鈦,遲滯現象,電洞傳輸層, Perovskite solar cell,Low temperature process,Flexible perovskite solar cells,TiO2,Hysteresis effect,hole transport layer, |
出版年 : | 2018 |
學位: | 碩士 |
摘要: | 鈣鈦礦太陽能電池具有製作成本低、吸收波段寬、載子束縛能小、電子電洞擴散長度長等優點,吸引許多研究團隊投入研究,鈣鈦礦已被廣泛應用於新世代光伏元件。近年來,穿戴式與攜帶式元件需求日益漸增,因此我們欲開發高效率以及高穩定性的可撓式鈣鈦礦太陽能電池。
本篇論文第一部分,探討低溫二氧化鈦(TiO2)奈米顆粒製程取代高溫TiO2燒結製程。首先優化低溫TiO2奈米顆粒製程,調變不同溫度控制TiO2奈米顆粒成長速度,低溫TiO2奈米顆粒大小約為20 – 30 nm,整個元件製程溫度可以控制於150 °C以下。比較高低溫製程元件各項特性,並以掃描式電子顯微鏡(SEM)、原子力顯微鏡(AFM)進行薄膜分析,低溫TiO2製程應用於玻璃基板上方效率約15.03 %,略低於高溫TiO2製程(約15.65 %)。將低溫TiO2製程應用於軟性基板上方,效率可達14.68 %。為了優化元件表現,以HMDS進行基板修飾,優化過後元件應用於軟性基板上方,效率可提升至16.24 %。為了更進一步了解軟性元件的可行性,我們進行機械穩定性測試,經過500次彎曲,元件效率維持於原先的88 %。 第二部分中,為了解決第一部分鈣鈦礦電池所產生的遲滯現象,我們選用NPB/MoO3取代Spiro作為電洞傳輸層(HTL)材料,減緩遲滯現象發生。蒸鍍不同厚度NPB材料,並且探討量測時間以及元件各項特性隨著NPB材料的厚度增加而改變。比較以Spiro作為HTL以及NPB/MoO3作為HTL的鈣鈦礦太陽能電池遲滯現象的差異,以NPB/MoO3取代Spiro作為電洞傳輸材料,明顯減緩遲滯現象指數,以Spiro作為電洞傳輸層元件的遲滯現象指數約為21.94 %,以NPB/MoO3作為電洞傳輸層元件的遲滯現象指數大幅下降至1.99 %。 Perovskite have a great number of advantages, including low production cost, broad band absorption, low exciton binding energy, and long carrier diffusion length. Numerous research groups devoted themselves to this promising material and its applications, especially perovskite solar cells (PSCs). So far, there are some issues that hinder PSCs’ application and commercialization such as hysteresis effect, process temperature and instability. Herein, we employ low-temperature-processed TiO2 and NPB/MoO3 to replace compact layer TiO2 and humidity-sensitive Spiro-OMeTAD, respectively. In the first part of this thesis, we synthesize low temperature processed (LTP) TiO2 nanoparticles as electron transport layer (ETL) to replace compact TiO2 layer which required high temperature sintering process (HTP). First, we optimize LTP TiO2 nanoparticles through controlling nucleation temperature. The optimized size of LTP TiO2 nanoparticles is about 20-30 nm. With LTP TiO2 nanoparticles, all processed temperature on perovskite solar cells can be controlled under 150 °C. The morphology and roughness of LTP TiO2 nanoparticles and HTP TiO2 are investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The best power conversion efficiency (PCE) on ITO/glass substrate is 15.03 % which is slightly less than HTP (~15.65 %). The PCE of devices on the ITO/PEN substrate is 14.68 % and that of devices on HDMS-treated substrate is over 16 %. To further explore the feasibility of our flexible devices, we analyze the mechanical stability of PSC on PEN. After 500 bending test, our devices maintain 88 % of original efficiency. In the second part, NPB/MoO3 are used to replace Spiro as hole transport layer (HTL). The hysteresis index (HI) of the device using Spiro as HTL is 21.94 % and that of the device using NPB/MoO3 as HTL is 1.99 %. Using NPB/MoO3 as HTL can eliminate hysteresis effect. Besides, light soaking effect was observable in NPB/MoO3 devices and X-ray/ultraviolet photoemission spectroscopy (XPS/UPS) were used to study its mechanisms in details. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/70398 |
DOI: | 10.6342/NTU201803318 |
全文授權: | 有償授權 |
顯示於系所單位: | 光電工程學研究所 |
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