利用帶有不同官能基的分子進行鈣鈦礦介面改質

Abstract

本論文主要探討正型鈣鈦礦太陽能電池在膜層之間的介面吻合問題，通過介面改質的方法，修補鈣鈦礦表面缺陷，降低漏電流及遲滯效應，從而提高鈣鈦礦元件電流密度，達到開發高效率、高穩定性的鈣鈦礦太陽能電池的目的。 本研究主要通過不同官能團修飾物修飾TiO2對電子傳輸層/主動層介面的改質效果，採用的結構為ITO/TiO2/鈣鈦礦（perovskite）/Spiro-OMeTAD/Au,通過低溫方式製備nanoparticle TiO2，並且用帶有不同官能團的分子對TiO2表面進行修飾，在TiO2納米顆粒上形成了交聯的網狀結構，形成Ti-O-R的化學鍵，並且用於修飾的R基分子僅存在于顆粒表面的最外層，並通過XPS測量，驗證修飾基官能團已修飾在TiO2納米顆粒表面；從UPS和UV-Visible量測，得出由GABA和Tiacac修飾後的TiO2，改進了導帶的位置，减小了载流子被trap在界面处的可能性，完成能级对准，使元件效率变高。 以此種方法將Tiacac,APTMS,GABA,IPTMS,45-Dich，CPTMS這6中不同分子修飾在TiO2上製成元件，在模擬AM1.5陽光下測得的太陽能電池中，經GABA（-NH2）改性的器件可實現17.39%的能量轉換效率.相較於未修飾的元件（能量轉換效率15.25%），效率顯著提升14.03%

This study mainly discusses the enhancement of the interface between the positive-type perovskite solar cells between the film layers. Through the method of interface modification, the surface defects of the perovskite are repaired, the leakage current and the hysteresis effect are reduced, thereby increasing the current density of the perovskite component, to achieve the purpose of developing high-efficiency, high-stability perovskite solar cells. Organic-inorganic perovskites, such as CH3NH3PbX3 (X = I, Br, Cl), due to the excellent optical and electronic properties of perovskites, including large absorption coefficients, low exciton binding energy and longer carrier diffusion length ,becoming a new material for manufacturing low-cost and high-efficiency solar cells. Over the past decade, the power conversion efficiency (PCE) has seen an amazing increase, proving the great potential of these perovskite materials. However, perovskite solar cells still have some problems,such as low built-in voltage, low crystallinity, and poor interface alignment, resulting in high leakage current, hysteresis, and ion migration, which affects device stability. Therefore, this study aims to repair the surface defects of perovskite through interface passivation, so as to develop perovskite solar cells with high power efficiency and high stability. The structure adopted in this research is ITO / TiO2 / perovskite / Spiro-OMeTAD / Au, TiO2 nanoparticle was prepared by low temperature, and the surface of TiO2 was modified with molecules with different functional groups on TiO2 nanoparticle，formed a cross-linked network structure, and the chemical bond of TI-O-R is formed, and the R-based molecules used for modification exist only on the outermost layer of the particle surface. In this way, a solar cell measured under simulated AM1.5 sunlight Among them, devices modified with GABA (-NH2) can achieve a power conversion efficiency of 17.39%, compared to those without modify components (power conversion efficiency 15.25%), which constitutes an ∼14.03% enhancement .