添加烷烴硫醇對聚(3-己烷基噻吩)與富勒烯衍生物為主動層的有機太陽能電池之影響

Effect on the performance of organic solar cell based on poly(3-hexylthiophene) and fullerene derivative with alkanethiols

許修齊(Hsiu-Chi Hsu)

指導教授 ： 郭欽湊

大同大學/工程學院/化學工程學系所/碩士(2010年)

摘要

本實驗中以烷基硫醇作為異質接面太陽能電池元件之改質劑，與聚(3-己烷基噻吩) (Poly(3-hexylthiophene)；P3HT)及PCBM ([6,6]-phenyl-C61-butyric acid methyl ester)相互摻混形成主動層材料，以改變烷基硫醇之添加種類、添加量，熱處理溫度，以及P3HT與PCBM摻混的比例進行對於光電轉換效率之影響比較。
根據XRD及AFM觀察可以得知添加十二烷基硫醇可以使元件的結晶強度提高及相分離程度為最佳。當以3 mg的十二烷基硫醇(1-dodecanethiol)當作改質添加物時，並以150 ℃進行主動層熱處理，電流密度與光電轉換效率可得最佳值，分別為14.2 mA/cm2及1.68%。
以霍爾效應測定添加十二烷基硫醇後的P3HT與PCBM之載子位移率，其實驗結果皆提升近10倍。再利用CV及UV-vis量測其氧化電位與紫外光吸收度，計算其HOMO與LUMO。由改質後的HOMO、LUMO得知，因添加烷基硫醇後可以使主動層與陰陽兩電極間的能階縮減，更能有利電子與電洞的傳遞。所以因添加3 mg的十二烷基硫醇使電荷分離與載子傳遞效果的提升，使得元件光電轉換效率提升4倍。

關鍵字

聚(3-己烷基噻吩) ； 十二烷基硫醇 ； 短路電流

並列摘要

In this study, studies on the power conversion efficiency of bulk heterojunction (BHJ) solar cells fabricated with poly(3-hexylthiophene) (P3HT)/[6,6]-phenyl C61-butyric acid methyl ester (PCBM) with the addition of alkanethiol molecules acted as modifier for the influence of the kinds of alkanethiol, the amount of the alkanethiol, annealing temperature, and weight ratio of P3HT/PCBM have been carried out.
According to the results of XRD and AFM measurements, the crystallinity of P3HT phase and the phase separation of P3HT/PCBM blends layer exhibit excellent phenomena for the addition of dodecanethiol. The optimal current density and power conversion efficiency of BHJ solar cell fabricated with P3HT/PCBM with addition of 3 mg dodecanethiol subjected to annealing treatment at 150℃ are 14.2 mA/cm2 and 1.68%, respectively.
The mobilities of P3HT and PCBM with the addition of dodecanethiol increase an order of magnitude larger than those of intrinsic P3HT and PCBM, respectively, by Hall effect measurement. The HOMO and LUMO can be calculated by CV and UV-vis absorption spectra measurements. It is found that the energy bandgap between active layer and cathode-anode electrodes reduces by the addition of dodecanethiol. The result can enhance the charge transport for electrons and holes. Therefore, the power conversion efficiency of the P3HT/PCBM with 3 mg of dodecanethiol solar cell increases fourfold larger than that of reference devices without any additives in the photoactive layer as a consequence.

並列關鍵字

short circuit current ； poly(3-hexylthiophene) ； dodecanethiol

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