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                                                                                                                                                                                                                                                                                                                                中國科學家為提升太陽能電池等光電轉換效率找到新辦法

                                                                                                                                                                                                                                                                                                                                2017-11-28   |  來源:煒業通科技

                                                                                                                                                                                                                                                                                                                                來自中國吉林大學一科研團隊在揭示二維半導體材料光物理機制上取得新進展,為提升太陽能電池等光電轉換效率找到新辦法。該成果于近日發表在國際著名學術期刊《自然通訊》雜志上。

                                                                                                                                                                                                                                                                                                                                近年來,既具有與石墨烯類似的極限物理厚度,又具有石墨烯所缺失的直接帶隙能帶結構的二維半導體單層材料——過渡族金屬硫族化合物單層,展現出了比石墨烯還豐富的光物理特性,在超薄且柔性的能量轉換及存儲領域受到了廣泛的關注。

                                                                                                                                                                                                                                                                                                                                吉林大學電子科學與工程學院集成光電子學國家重點聯合實驗室孫洪波-王海宇教授科研團隊與新加坡國立大學、倫敦帝國理工學院等單位合作,發現了以二硫化鉬單層為代表的該類材料中高能熱載流子產生新途徑和提取高效性,對于深入理解相關二維器件的光物理圖像和工作機制提供了原理性的解釋,同時也為提高二維半導體材料在太陽能電池等光電應用領域的能量轉換效率提供了新的啟示。

                                                                                                                                                                                                                                                                                                                                據了解,在以太陽能電池為代表的光電應用中,光電轉換效率是最為重要的指標之一。在傳統的由體材料半導體制備的光伏器件中,由于光生熱載流子會通過發射聲子的方式極其快速地弛豫到能帶底部,這一過程會產生無法有效利用的熱量,從而在理論上將太陽能電池的最高光電轉換效率限制在約31%;若能利用材料的某些特性來充分減慢熱載流子的冷卻過程,使這些熱載流子能在弛豫到能帶底部之前被提取出來的話,則在理論上有可能將光伏器件的最高光電轉換效率提高一倍。

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