奈米銀氧化石墨烯對高分子太陽能電池光電轉換效率的影響

EFFECT OF GRAPHENE OXIDE/AG NANOPARTICLES ON THE EFFICIENCY OF POLYMER SOLAR CELLS

歐珍方(Cheng-Fang Ou)

《技術學刊》 36卷3期 (2021/09) Pp. 115-122

摘要

我們採用改良式Hummer法製備之氧化石墨作為氧化石墨烯（grapheme oxide, GO）之前驅物，以硝酸銀（AgNO_3）作為奈米銀粒子前驅物，以檸檬酸鈉做為還原劑合成三種奈米銀氧化石墨烯（GOAg），分別命名為GOAg-1、GOAg-2與GOAg-3。我們將奈米銀石墨烯以濃度1.5 mg/ml分散於N-methyl pyrrolidone （NMP）中，塗佈插層於PEDOT：PSS電動傳輸層與P3HT：PCBM組成的主動層間來製備高分子太陽能電池，研究奈米銀氧化石墨烯對高分子太陽電池光電特性之影響。本研究之太陽能電池元件結構為Glass／ITO／PEDOT：PSS／GOAg／P3HT：PCPDTBT：PC_(61)BM／Ca／Al，我們利用紫外光－可見光吸收光譜儀（UV-Vis）、掃描探針顯微鏡（SPM）、場發射電子顯微鏡（FESEM）和太陽光模擬光源系統，來測量吸收度、粗糙度、表面形態和光電性質。由結果得知，插層這三種GOAg之高分子太陽能電池之短路電流密度（short-circuit current density, J_(sc)）、填充因子（fill factor, FF）與光電轉換效率（power conversion efficiency, PCE%）皆比未含奈米銀氧化石墨烯之電池高，顯示插層這三種GOAg於電動傳輸層與主動層間皆能有效提高電池之光電性質。三種GOAg中以GOAg-2具最佳提升效果，因為此電池具有最高的短路電流密度與光電轉換效率，分別為9.71 mA/cm^2與4.02%，與未含奈米銀氧化石墨烯之電池比較分別提升了36.4%與80.3%，此結果可能是由於石墨烯具有高電子遷移率，因此提升了高分子太陽能電池之光電性質。

關鍵字

高分子太陽能電池 ； 氧化石墨烯 ； 奈米銀氧化石墨烯 ； 光電轉換效率

並列摘要

Graphene oxide / Ag nanoparticles (GOAg) were fabricated via a facile method, employing graphite oxide as a precursor of graphene oxide (GO), AgNO_3 as a precursor of Ag nanoparticles, and sodium citrate as a reducing and stabilizing agent. We synthesized three kinds of GOAg as GOAg-1, GOAg-2 and GOAg-3. We investigated the effect of incorporating GOAg between the hole transfer layer (HTL) of poly (ethylene dioxythiophene) (PEDOT)-polystyrene sulfonic acid (PSS) (PEDOT : PSS) and active layer (P3HT:PCBM = 1:1 weight ratio) on the photovoltaic performance. The cell structure was Glass / ITO / PEDOT : PSS / GOAg / P3HT : PCBM / Ca / Al. The concentration of GOAg solution was 1.5 mg/ml in N-methyl pyrrolidone (NMP) solvent and the GOAg layer was coated on the HTL layer by spin-coating. We used the UV-Vis, SPM, FE-SEM and solar simulator to measure the absorbance, roughness, surface morphology, and power conversion efficiency (PCE), respectively. From these results, we found that the short circuit current density (J_(sc)), fill factor (FF) and PCE of the cells with GOAg are always higher than those of cell without GOAg. The cell with GOAg-2 has the highest short circuit current density 9.71 mA/cm^2, an increase of 36.4%, and the highest power conversion efficiency 4.02%, an increase of 80.3%. These improvements are due to the high carrier mobility of graphene.

並列關鍵字

polymer solar cell ； graphene oxide ； graphene oxide/Ag nanoparticles ； power conversion efficiency

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