具載子平衡之五苯環摻雜主動層的反置高分子有機太陽能電池研究

Investigation of Inverted Polymer Solar Cells with Carrier-Balanced Pentacene Doped Active Layer

黃鴻麟(Hung-Lin Huang) ； 李欣縈(Hsin-Ying Lee) ； 李清庭(Ching-Ting Lee)

《真空科技》 27卷1期 (2014/03) Pp. 38-42

摘要

本研究利用微量五苯環（pentacene）摻雜於反置高分子有機太陽能電池之主動層中，成功製作具載子遷移率平衡之反置高分子有機太陽能電池主動層。其中，利用空間電荷限制電流（SCLC）法分析與量測單載子電洞元件及單載子電子元件之載子遷移率，以探討摻雜五苯環之機制，其單載子電洞元件與單載子電子元件結構分別為金／主動層／三氧化鉬／銀與銦錫氧化物／氧化鋁鋅／主動層／鋁。由實驗結果顯示，當主動層摻雜0.065重量比的五苯環時，可使電洞及電子遷移率達到平衡（μh/μe=1），如此可以有效改善反置高分子有機太陽能電池之功率轉換效率，其造成載子平衡之現象可歸因於摻雜五苯環可提升電洞遷移率及降低電子遷移率。比較未摻雜五苯環與具摻雜五苯環之反置高分子有機太陽能電池，經摻雜五苯環重量比為0.065之反置高分子有機太陽能電池之轉換效率具有較佳的元件特性，其元件短路電流為11.26 mA/cm^2、開路電壓為0.61 V、填充因子為62.81 %及功率轉換效率為4.31%。

關鍵字

載子遷移率平衡 ； 反置高分子有機太陽能電池 ； 五苯環 ； 空間電荷限制電流

並列摘要

In this study, the inverted polymer solar cells with balanced carrier mobility were successfully fabricated by slightly doping the pentacene into the active layer. To investigate the mechanism of pentacene doping, the carrier mobility was analyzed and measured using the space-charge-limited current (SCLC) method for the hole-only devices and the electron-only devices. The hole-only device with Au/active layer/MoO3/Ag structure and the electron-only device with ITO/AZO/active layer/ Al structure were fabricated, respectively. The experimental results showed that the balanced holeelectron mobility (μh/μe =1) was achieved, when the pentacene contents was 0.065 by weight in the active layer, which could improve the power conversion efficiency of the resulting inverted polymer solar cells. This phenomenon of balanced carrier mobility was attributed to the increase of the hole mobility and the decrease of the electron mobility by the pentacene-doped active layer. Compared with the inverted polymer solar cells without pentacene-doping, the solar cells with pentacene-doped active layer exhibited better performances. The short-circuit current was 11.26 mA/cm^2, the open-circuit voltage was 0.61 V, the fill factor was 62.81%, and the power conversion efficiency was 4.31%.

並列關鍵字

Balanced carrier mobility ； Inverted polymer solar cells ； Pentacene ； Space-charge-limited current