聚苯駢噻吩衍生物予體混摻小分子受體三成份系統高效率太陽能電池之研究

本研究主要構想在於提升太陽能電池的光電轉換效率，藉由活性層材料的選擇、活性層形態處理與元件製程改善以達到提升效率之目的。以往文獻達到高效率(PCE>12%)的高分子太陽能電池文獻所使用的小分子大多為吸收波長小於800 nm，為了達到充分使用太陽光的目的，本研究選用2017年Hou團隊設計出吸收波長可達近1000 nm的新穎小分子IEICO-4F[33]以及碳球小分子PC71BM作為電子受體，搭配本實驗室設計出的低能隙高分子PTB7-Th來達到高效率的目的。本研究提出使用吸收波長彼此互補的IEICO-4F和PC71BM小分子以及PTB7-Th高分子混摻形成三成份系統高分子太陽能電池，文獻上IEICO-4F或PC71BM混摻PTB7-Th的系統，其元件效率都可達10%，代表兩小分子都可與PTB7-Th有良好的活性層形態，基於以上原因將PTB7-Th、IEICO-4F和PC71BM混摻製作高分子太陽能電池，三成份系統效率為11.82%，在加入1-chloronaphthalene(Cl-na)添加劑以及經過1vol% DIO溶於乙醇的表面溶液處理後，使活性層分子排列增加、提升PTB7-Th的激子解離效率提升以及電子和電洞的遷移率，光電轉換效率也因此從11.82%大幅提升至14.18%。

關鍵字

聚苯駢噻吩衍生物；三成分系統；表面溶液處理；高分子太陽能電池

並列摘要

The main idea of this study is to improve the PCE of solar cells by selecting the active layer materials, the active layer morphology treatment and component process improvement. Most of the small molecules used in the literature on high-efficiency (PCE>12%) polymer solar cells, the absorption wavelength less than 800 nm. In order to absorb sunlight efficiency, this study selected the fullerene derivate PC71BM and the designed absorption wavelength of novel small molecule IEICO-4F[33], which are close to 1000 nm from Hou team 2017, as electron acceptors. Then blend with the low band gap polymer PTB7-Th designed by our laboratory to achieve higher efficiency. This study proposes a ternary system polymer solar cell by utilizing the IEICO-4F, PC71BM and PTB7-Th with complementary absorption bands. Both IEICO-4F and PC71BM blended with PTB7-Th of PCE in the literature can reach 10%, which means that both small molecules have a suitable active layer morphology with PTB7-Th. The PCE of polymer solar cell blended by PTB7-Th, IEICO-4F and PC71BM is 11.82%. Besides, adding 1-chloronaphthalene (Cl-na) additive and solution treatment of 1vol% DIO in ethanol is able to enhance the molecular arrangement of the active layer and the exciton dissociation efficiency of PTB7-Th. Also the Cl-na adding and 1vol% DIO in EtOH treatment can improve the electron mobility and the hole mobility. Thus increased the photoelectric conversion efficiency significantly from 11.82% to 14.18%.