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標題: | 低能隙共軛高分子材料與氧化鎳電洞傳輸層於有機太陽能電池的特性分析 The investigation of low band-gap conjugated polymers and nickel oxide hole transport layers in organic solar cells |
作者: | An-Lun Lo 羅安倫 |
指導教授: | 吳志毅(Chih-I Wu) |
關鍵字: | 共軛高分子,有機太陽能電池,本體異質接面,氧化鎳,電洞傳輸層, conjugated polymers,organic solar cells,bulk heterojunction,nickel oxide,hole transport layers, |
出版年 : | 2013 |
學位: | 碩士 |
摘要: | 本篇論文探討以低能隙共軛高分子材料為主動層和氧化鎳為電洞傳輸層的本體異質接面太陽能電池特性。
首先,論文以PCDTBT和PC71BM為主動層材料之元件進行研究。藉由降低主動層的厚度,使短路電流密度與元件效率有所提升。接著探討在蒸鍍鋁電極之前,以鈣、氟化鋰以及bathocuproine (BCP) 做為緩衝層對元件特性的影響,而使用LiF和BCP做為緩衝層的元件有較高的短路電流密度,其中BCP元件效率最高,為4.19%。藉由表面形貌的控制,在主動層中加入添加劑1,6-二碘己烷(DIH)可使元件效率提升至4.57%。 第二部分以P3HT和PC61BM為主動層材料進行氧化鎳電洞傳輸層的研究。藉由X光電子頻譜 (XPS) 和紫外光電子頻譜 (UPS) 分析氧化鎳的後處理影響,使用UV Ozone後氧化鎳中的金屬陽離子空缺增加,將有助於電洞的傳導,且功函數由4.8 eV上升至5.1 eV。在UV Ozone時間為10分鐘時達到最大的填充係數與效率,和PEDOT:PSS元件相比,氧化鎳元件達到相近的效率與開路電壓、較佳的填充係數、稍小的短路電流密度。此外,氧化鎳的元件效能較PEDOT:PSS有更好的穩定度。 第三部份以PBDTTT-C-T和PC71BM為主動層材料之元件進行研究,透過主動層參數的調變如厚度、濃度等以達到最佳化的效率,為6.1%。和P3HT相比,由於PBDTTT-C-T的吸收頻譜較廣,且最高佔據分子軌域 (HOMO) 較深,因此元件有較高的短路電流密度與開路電壓。接著將氧化鎳電洞傳輸層應用在PBDTTT-C-T元件,由於使用UV Ozone時間增加會使氧化鎳穿透度降低,因此最佳的UV Ozone時間為2分鐘,效率為5.37%。雖然效率不及PEDOT:PSS元件,然而其效率維持度仍較PEDOT:PSS元件為佳。 The performance of bulk heterjuction (BHJ) solar cells based on low band-gap conjugated polymers and nickel oxide hole transport layers are studied in this thesis. In the first topic of this thesis, the devices of PCDTBT mixed with PC71BM as active layer materials are investigated. By decreasing the thickness of the active layer, the short circuit current density (Jsc) and power conversion efficiency (PCE) are enhanced. Comparing the devices with calcium, lithium fluoride and bathocuproine (BCP) as cathode buffer layers before the deposition of Al electrodes, Jsc of the devices with LiF and BCP buffer layers is higher and PCE of the devices with BCP buffer layers is the highest. The PCE of the device is 4.19%. To control the morphology of the active layer, 1,6-diiodohexane(DIH) is used as an additive, which results in increased PCE to 4.57%. In the second topic, we investigate the device of P3HT: PC61BM based organic solar cells using nickel oxide (NiOx) as the hole transport layers. Via x-ray and ultraviolet photoemission spectroscopy (UPS and XPS), the effects of post-treatment applied to NiOx is investigated. UV Ozone treatment on NiOx results in more metal cation vacancies which contribute to hole transport efficiency. The work function then increases from 4.8 eV to 5.1 eV. The device with ten minutes UV Ozone treatment of the NiOx has maximum fill factor (FF) and PCE. The devices with PEDOT:PSS and the devices with NiOx have similar PCE and Voc , but the former has higher FF and slightly lower Jsc. Additionally, the stability of the devices with NiOx is better than the devices with PEDOT:PSS. In the third topic, we study the device of PBDTTT-C-T: PC71BM as the active layer materials. To achieve the optimized PCE, the active layer parameters such as thickness and concentration are tuned, resulting in the best PCE of 6.10%. Due to the broadened absorption wavelength range and deeper highest occupied molecular orbital (HOMO) of PBDTTT-C-T in comparison with P3HT, Jsc and Voc are higher of the device with PBDTTT-C-T. Then, the NiOx layer is used to replace PEDOT:PSS as the hole transport layer. Since longer UV Ozone treatment time reduces transmission of NiOx, the device with two minutes UV Ozone treatment of NiOx exhibit the optimal PCE of 5.37%. Although PCE of the NiOx device is not as good as that of the PEDOT:PSS device, the stability of the devices with NiOx is much better. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/17494 |
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顯示於系所單位: | 光電工程學研究所 |
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