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/ 博客文章 / 電池知識 / 超薄太陽能電池? 超薄太陽能電池?
超薄太陽能電池改進:二維鈣鈦礦化合物擁有挑戰笨重產品的合適材料。
萊斯大學的工程師在設計由半導體鈣鈦礦製成的原子級薄太陽能電池方面取得了新的基準,提高了其效率,同時保持了其承受環境的能力。
萊斯大學喬治·R·布朗工程學院的Aditya Mohite實驗室發現,陽光使二維鈣鈦礦中原子層之間的空間縮小,足以使材料的光伏效率提高18%之多,這是經常性的進展。 該領域已經實現了巨大的飛躍,並以百分比來衡量。
Mohite 表示:“10 年來,鈣鈦礦的效率從約 3% 飆升至 25% 以上。” “其他半導體將需要大約 60 年才能實現。這就是我們如此興奮的原因。”
鈣鈦礦是一種具有立方晶格的化合物,是一種高效率的光收集器。 它們的潛力多年來一直為人所知,但它們有一個問題:它們可以將陽光轉化為能量,但陽光和濕氣會使它們降解。
「太陽能電池技術預計將持續 20 至 25 年,」化學和生物分子工程以及材料科學和奈米工程副教授 Mohite 說。 「我們已經工作多年,並繼續使用大型鈣鈦礦,它們非常有效,但不太穩定。相比之下,二維鈣鈦礦具有出色的穩定性,但效率不足以放置在屋頂上。
“最大的問題是在不影響穩定性的情況下提高它們的效率。”
萊斯大學的工程師及其來自普渡大學和西北大學、美國能源部國家實驗室洛斯阿拉莫斯、阿貢和布魯克海文以及法國雷恩電子與數位技術研究所(INSA)的合作者發現,對於某些二維鈣鈦礦,陽光有效地縮小了原子之間的空間,從而提高了它們承載電流的能力。
「我們發現,當你點燃材料時,你會像海綿一樣擠壓它,並將各層聚集在一起,以增強該方向的電荷轉移,」莫赫特說。 研究人員發現,在頂部的碘化物和底部的鉛之間放置一層有機陽離子可以增強層之間的相互作用。
「這項工作對於激發態和準粒子的研究具有重要意義,其中一層正電荷在另一層,負電荷在另一層,它們可以相互交談,」莫赫特說。 「這些被稱為激子,它們可能具有獨特的性質。
「這種效應使我們能夠理解和調整這些基本的光與物質相互作用,而無需創建複雜的異質結構,例如堆疊的二維過渡金屬二硫屬化物,」他說。
法國的同事用電腦模型證實了這個實驗。 INSA 物理學教授Jacky Even 表示:「這項研究提供了一個獨特的機會,將最先進的從頭計算模擬技術、使用大型國家同步加速器設施的材料研究以及運行中的太陽能電池的原位表徵相結合。 」 」。 “這篇論文首次描述了滲流現像如何突然釋放鈣鈦礦材料中的充電電流。”
兩項結果均表明,在太陽強度下暴露於太陽模擬器 10 分鐘後,二維鈣鈦礦沿其長度收縮了 0.4%,從上到下收縮約 1%。 他們證明,在五種陽光強度下,1分鐘內就能看到效果。
萊斯大學研究生、共同主要作者李文斌表示:“聽起來似乎不多,但晶格間距縮小 1% 就會導致電子流大幅增加。” “我們的研究表明,該材料的電子傳導能力增加了三倍。”
同時,晶格的性質使材料即使在加熱至 80 攝氏度(176 華氏度)時也能抵抗降解。 研究人員還發現,一旦燈關閉,晶格就會很快恢復到其標準配置。
「二維鈣鈦礦的主要吸引力之一是它們通常具有有機原子,可以充當濕度屏障,具有熱穩定性,並解決離子遷移問題,」研究生兼共同主要作者 Siraj Sidhik 說。 「2D 鈣鈦礦容易出現熱和光不穩定性,因此研究人員開始在巨大的鈣鈦礦頂部放置 3D 層,看看是否可以充分利用這兩種特性。
「我們認為,讓我們轉向 2D 並提高效率,」他說。
為了觀察材料的收縮情況,研究團隊使用了美國能源部(DOE)科學辦公室的兩個使用者設施:美國能源部布魯克海文國家實驗室的國家同步加速器光源II和美國能源部先進國家實驗室美國能源部阿貢國家實驗室。 光子源(APS)實驗室。
該論文的合著者阿貢物理學家 Joe Strzalka 使用 APS 的超亮 X 射線即時捕捉材料中微小的結構變化。 APS 光束線 8-ID-E 處的靈敏儀器允許進行「操作」研究,這意味著設備在正常操作條件下經歷溫度或環境的受控變化時進行的研究。 在這種情況下,Strzalka 和他的同事將太陽能電池中的感光材料暴露在模擬陽光下,同時保持溫度恆定,並觀察到原子層級上的微小收縮。
作為對照實驗,斯特扎爾卡和他的合著者保持房間黑暗,提高溫度,並觀察到相反的效果——材料膨脹。 這顯示引起這種轉變的是光本身,而不是它產生的熱量。
「對於此類變化,進行營運研究非常重要,」斯特扎爾卡說。 “就像機械師想要運行引擎來查看其中發生了什麼一樣,我們本質上是想拍攝此轉換的視頻,而不是單個快照。APS 等設施使我們能夠做到這一點。”
Strzalka指出,APS正在進行重大升級,將其X射線的亮度提高多達500倍。 他說,當它完成後,更亮的光束和更快、更銳利的探測器將提高科學家以更高的靈敏度探測這些變化的能力。
這可以幫助萊斯團隊調整材料以獲得更好的性能。 「我們正在設計陽離子和介面,以實現 20% 以上的效率,」Sidhik 說。 「這將改變鈣鈦礦領域的一切,因為那時人們將開始將2D鈣鈦礦用於2D鈣鈦礦/矽和2D/3D鈣鈦礦系列,這可以使效率接近30%。這將使其商業化具有吸引力。”