研究生: |
詹宗儒 Tzung-ru Jan |
---|---|
論文名稱: |
不同前驅物油墨以網印法製備硒化銅錫鋅吸收層及其元件分析 Preparation, analysis, and device performance of paste-printed CZTSe absorbers by using different precursors |
指導教授: |
郭東昊
Dung-hau Kuo |
口試委員: |
陳詩芸
Shih-Yun Chen 薛人愷 Ren-kai Chiue |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 材料科學與工程系 Department of Materials Science and Engineering |
論文出版年: | 2012 |
畢業學年度: | 100 |
語文別: | 中文 |
論文頁數: | 114 |
中文關鍵詞: | 硒化銅錫鋅 、網印法 |
外文關鍵詞: | CZTSe, paste-printed |
相關次數: | 點閱:204 下載:1 |
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摘要
近年來,能源出現危機,大家紛紛投入太陽能電池的研究與發展。目前化合物太陽能電池以硒化銅銦鎵為主,但由於成本高昂,故無法普及化,因此需要新的材料來控制成本,而發展出硒化銅錫鋅與硫化銅錫鋅兩種化合物太陽能電池,因錫、鋅的含量豐富且其硒化物能隙為0.9~1.07 eV、硫化物為1.5 eV,適合拿來做替換材料。
本實驗利用油墨網印法製備硒化銅錫鋅太陽能電池,並探討四種不同冷壓過的組成A(CZTSe-陶瓷)、組成B(CZTSe-陶瓷+20mol%Te)、組成C(CZTSe-陶金)與D(CZTSe-金屬)所配製的油墨在不同燒結及硒化溫度(600℃、650℃與700℃)對硒化銅錫鋅吸收層與太陽能元件之特性的影響,研究中透過FE-SEM、XRD及EDS分析吸收層物理性質,將其各參數製備成元件(Ag/ITO(RF)/i-ZnO(RF)/CdS(CBD)/CZTSe(ink printing) /CIGSe(DC)/Mo(DC)/Al2O3),利用擬太陽能光測試儀器測試其電池之轉換效率。
實驗結果顯示,經油墨網印後冷壓之組成A與組成B,經兩階段燒結後(第一階段300℃,第二階段600℃~700℃)所製備之吸收層,透過FE-SEM分析發現,隨著溫度的升高,其表面有較佳的緻密性,但並無晶粒之發現;XRD繞射圖顯示,組成A與組成B於600℃~700℃進行二階段燒結後,皆有明顯的二次相存在;經油墨網印後冷壓之組成C與組成D,經兩階段硒化反應後(第一階段300℃,第二階段600℃~700℃)所製備之吸收層,透過FE-SEM分析發現,隨著溫度的升高,其表面有較佳的緻密性、平滑的表面及顯著成長的晶粒;XRD繞射圖顯示,組成C與組成D於600℃~700℃進行二階段硒化反應後,皆為CZTSe單一相。將組成C、D參數製備元件進行EDS分析及霍爾量測,皆為缺銅之p-type半導體。將此兩組製程參數製備成電池元件,其光電轉換效率分別為1.465%及1.138%。
Abstract
Due to energy crisis, the research of solar cells is recently much more attractive. The main compound solar cell is the Cu(In,Ga)Se2 system, but the high cost has limited its further applications. Lowing the cost with the finding of new materials is necessary, therefore Cu2ZnSnS4(CZTS) and Cu2ZnSnSe4 (CZTSe) solar cells with energy band gaps of 1.5 eV and 0.9-1.07eV, respectively, are developed.
In this study, CZTSe solar cells were prepared by using paste-printing on alumina substrates. Four kinds of cold-pressed absorber layers with the composition A(CZTSe-ceramic), B(CZTSe-ceramic+20mol%Te), C(CZTSe-cermet), and D(CZTSe-metal) were prepared by paste printing. Sintering and selenization were conducted by a two-step heating procedure. The first step was at 300℃for 1 h and it held at 600 ℃,650℃ or 700℃ at the second step. The CZTSe solar cell was constituted with the stacking of Ag/ITO/ZnO/CdS/screen-printed CZTSe/CIGS/Mo/Al2O3. The quality of the absorption layer was analyzed by XRD and FE-SEM microscope equipped with energy dispersive X-ray spectrometer. The performance of the solar cells was evaluated under the standard AM1.5 illumination.
The experimental results showed surface morphologies of paste-printed CZTSe films with composition-A and composition-B became denser but were unable to observe grains after the precursor films were selenized at higher temperatures with a two-step heating procedure.
For paste-printed CZTSe films with composition-C and composition-D, it became denser and smooth and the larger grains were easily observed after the precursor films were selenized at higher temperatures with a two-step heating procedure. The CZTSe films were a single phase at different selenization temperatures. Electrical properties of the selenized films were measured. The solar cell devices made from composition-C and composition-D were evaluated after a two-step selenization at 650℃ with power conversion efficiencies of 1.465% , 1.138%, respectively.
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