Jung Sehyun, Choi Seungsun, Shin Woojin, Oh Hyesung, Kim Nahyun, Kim Sunghun, Kim Namkook, Kim Kyuhyun, Lee Hyunbok
Department of Physics, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si 24341, Republic of Korea.
Molecules. 2024 Sep 19;29(18):4440. doi: 10.3390/molecules29184440.
Copper(I) thiocyanate (CuSCN) is considered an efficient HTL of low cost and with high stability in perovskite solar cells (PSCs). However, the diethyl sulfide solvent used for CuSCN preparation is known to cause damage to the underlying perovskite layer in n-i-p PSCs. Antisolvent treatment of CuSCN during spin-coating can effectively minimize interfacial interactions. However, the effects of antisolvent treatment are not sufficiently understood. In this study, the effects of five different antisolvents were investigated. Scanning electron microscopy and X-ray diffraction analyses showed that the antisolvent treatment improved the crystallinity of the CuSCN layer on the perovskite layer and reduced damage to the perovskite layer. However, X-ray and ultraviolet photoelectron spectroscopy analyses showed that antisolvent treatment did not affect the chemical bonds or electronic structures of CuSCN. As a result, the power conversion efficiency of the PSCs was increased from 14.72% for untreated CuSCN to 15.86% for ethyl-acetate-treated CuSCN.
硫氰酸亚铜（CuSCN）被认为是一种高效的空穴传输层，在钙钛矿太阳能电池（PSC）中成本低且稳定性高。然而，用于制备CuSCN的二乙硫醚溶剂已知会对n-i-p型PSC中的底层钙钛矿层造成损害。旋涂过程中对CuSCN进行反溶剂处理可有效减少界面相互作用。然而，反溶剂处理的效果尚未得到充分了解。在本研究中，研究了五种不同反溶剂的效果。扫描电子显微镜和X射线衍射分析表明，反溶剂处理提高了钙钛矿层上CuSCN层的结晶度，并减少了对钙钛矿层的损害。然而，X射线和紫外光电子能谱分析表明，反溶剂处理并未影响CuSCN的化学键或电子结构。结果，PSC的功率转换效率从未经处理的CuSCN的14.72%提高到经乙酸乙酯处理的CuSCN的15.86%。
