化学
拉曼光谱
光电效应
分析化学(期刊)
结晶度
吸收光谱法
电化学
带隙
钴
衍射
结晶学
无机化学
物理化学
光学
电极
材料科学
光电子学
物理
色谱法
作者
Nataly Carolina Rosero-Navarro,C. Núñez,Darío Espinoza,Karem Gallardo,Iván Brito,Rodrigo Castillo
标识
DOI:10.1021/acs.inorgchem.3c02574
摘要
We report the synthesis, characterization, and photoelectric and electrochemical properties of (CH3NH3)2Zn1-xCoxBr4 (x = 0.0, 0.3, 0.5, 0.7, and 1.0) samples. X-ray powder and single-crystal diffraction confirm the formation of solid solution across the entire range. Additionally, as the cobalt concentration increases, the crystallinity of the samples decreases, as indicated by the powder diffraction patterns. All samples remain stable up to 560 K, beyond which they decompose into CH3NH3Br and the respective bromide. The semiconductor behavior of the compounds is confirmed through optical absorption measurements, and band gap values are determined by using the Tauc method from diffuse reflectance spectra. Raman spectroscopy reveals a slight redshift in all vibration modes with increasing cobalt content. Finally, photovoltaic measurements on solar cells constructed with (MA)2CoBr4 perovskite exhibit modest performance, and electrochemical measurements indicate that the compound with the composition (MA)2Zn0.3Co0.7Br4 exhibits the highest current for electrochemical water reduction during oxygen evolution.
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