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Effect of absorber surface modification on the optoelectronic properties of Cu2CdGeSe4 solar cells.
Thin Solid Films ( IF 2.1 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.tsf.2020.137822
X. Li , M. Pilvet , K. Timmo , M. Grossberg , M. Danilson , V. Mikli , M. Kauk-Kuusik

Abstract High quality Cu2CdGeSe4 micro-crystalline powder has been synthesized by molten salt method at 700 °C in closed quartz ampoules using elemental Ge, binary CdSe and CuSe as precursor materials and KI as flux material. The effect of initial Cu and Cd content on the bulk composition of grown crystals was investigated. According to energy dispersive X-ray spectroscopy results, the two types of Cu2CdGeSe4 powders, with nearly stoichiometric and with Cd-rich composition were synthesized. X-ray diffraction and Raman analyses confirmed that all studied Cu2CdGeSe4 crystals had orthorhombic crystal structure. It was essential to chemically and thermally modify the surface of crystals before implementing the powder crystals as absorber materials in monograin layer solar cells. Results showed that both Br2−MeOH and HCl combined with KCN etching were effective to remove secondary phases on the crystal surface. Raman and X-ray photoelectron spectroscopy analyses revealed that after annealing at 400 °C the crystal surface is covered by GexSe1-x phase, which was effectively removed by KCN etching. Using this approach, we achieved Cu2CdGeSe4 monograin layer device conversion efficiency of 5.7%.

中文翻译:

吸收体表面改性对Cu2CdGeSe4太阳能电池光电性能的影响。

摘要 以元素Ge、二元CdSe和CuSe为前驱体材料,以KI为助熔剂,采用熔盐法在封闭石英安瓿瓶中,在700 ℃条件下合成了高质量的Cu2CdGeSe4微晶粉末。研究了初始 Cu 和 Cd 含量对生长晶体的整体组成的影响。根据能量色散 X 射线光谱结果,合成了两种类型的 Cu2CdGeSe4 粉末,具有接近化学计量和富含 Cd 的成分。X 射线衍射和拉曼分析证实所有研究的 Cu2CdGeSe4 晶体都具有正交晶体结构。在将粉末晶体用作单晶粒层太阳能电池中的吸收材料之前,必须对晶体表面进行化学和热改性。结果表明,Br2−MeOH 和 HCl 结合 KCN 蚀刻均能有效去除晶体表面的第二相。拉曼和 X 射线光电子能谱分析表明,在 400°C 下退火后,晶体表面被 GexSe1-x 相覆盖,该相被 KCN 蚀刻有效去除。使用这种方法,我们实现了 5.7% 的 Cu2CdGeSe4 单晶层器件转换效率。
更新日期:2020-03-01
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