Sajid Sajid, Alzahmi Salem, Wei Dong, Salem Imen Ben, Park Jongee, Obaidat Ihab M
Department of Chemical & Petroleum Engineering, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates.
National Water and Energy Center, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates.
Nanomaterials (Basel). 2023 Jan 6;13(2):250. doi: 10.3390/nano13020250.
Simplifying device layout, particularly avoiding the complex fabrication steps and multiple high-temperature treatment requirements for electron-selective layers (ESLs) have made ESL-free perovskite solar cells (PSCs) attractive. However, the poor perovskite/substrate interface and inadequate quality of solution-processed perovskite thin films induce inefficient interfacial-charge extraction, limiting the power conversion efficiency (PCEs) of ESL-free PSCs. A highly compact and homogenous perovskite thin film with large grains was formed here by inserting an interfacial monolayer of diethanolamine (DEA) molecules between the perovskite and ITO substrate. In addition, the DEA created a favorable dipole layer at the interface of perovskite and ITO substrate by molecular adsorption, which suppressed charge recombination. Comparatively, PSCs based on DEA-treated ITO substrates delivered PCEs of up to 20.77%, one of the highest among ESL-free PSCs. Additionally, this technique successfully elongates the lifespan of ESL-free PSCs as 80% of the initial PCE was maintained after 550 h under AM 1.5 G irradiation at ambient temperature.
简化器件布局，特别是避免电子选择性层（ESL）复杂的制造步骤和多次高温处理要求，使得无ESL的钙钛矿太阳能电池（PSC）具有吸引力。然而，钙钛矿/衬底界面较差以及溶液处理的钙钛矿薄膜质量不足会导致界面电荷提取效率低下，限制了无ESL的PSC的功率转换效率（PCE）。通过在钙钛矿和ITO衬底之间插入二乙醇胺（DEA）分子的界面单层，在此处形成了具有大晶粒的高度致密且均匀的钙钛矿薄膜。此外，DEA通过分子吸附在钙钛矿和ITO衬底的界面处形成了有利的偶极层，从而抑制了电荷复合。相比之下，基于DEA处理的ITO衬底的PSC的PCE高达20.77%，是无ESL的PSC中最高的之一。此外，该技术成功延长了无ESL的PSC的寿命，在室温下AM 1.5 G光照550小时后，初始PCE的80%得以保持。
