High-Efficiency Colloidal Quantum Dot Photovoltaics via Robust Self-Assembled Mono layers
High-Efficiency Colloidal Quantum Dot Photovoltaics via Robust Self-Assembled Mono layers
复制标题
DOI：
10.1021/acs.nanolett.5b03677
复制
发表时间：
2015-11-01
期刊：
影响因子：
10.8
通讯作者：
Sargent, Edward H.
中科院分区：
文献类型：
--
作者：
Kim, Gi-Hwan;de Arquer, F. Pelayo Garcia;Sargent, Edward H.
由胶体量子点（CQD）提供的光电可调谐性对于光伏应用是有吸引力的，但是需要在电极处适当的能带对准以用于以最小的电压成本进行有效的电荷提取。考虑到这一目标，自组装单分子膜（SAM）可以用来局部修改界面能级。然而，为了有效，必须使SAM对于使用制造高质量CQD固体所需的各种溶剂和配体的处理是稳健的。我们报告了强大的自组装单分子膜（R-SAMs），使我们能够提高CQD光催化剂的效率。只有通过开发一种用于芳族SAM的安全锚定的方法，通过在无水沉积环境中沉积SAM来辅助，我们才能够提供一种界面改性，该界面改性对于CQD固体制造中所需的随后的化学处理是稳健的。整流界面处的能量对准通过调整R-SAM以相对于CQD量子限制电子能级进行最佳对准来定制。这导致CQD PV记录功率转换效率（PCE）为10.7%，相对于对照具有增强的再现性。
The optoelectronic tunability offered by colloidal quantum dots (CQDs) is attractive for photovoltaic applications but demands proper band alignment at electrodes for efficient charge extraction at minimal cost to voltage. With this goal in mind, self-assembled monolayers (SAMs) can be used to modify interface energy levels locally. However, to be effective SAMs must be made robust to treatment using the various solvents and ligands required for to fabricate high quality CQD solids. We report robust self-assembled monolayers (R-SAMs) that enable us to increase the efficiency of CQD photovoltaics. Only by developing a process for secure anchoring of aromatic SAMs, aided by deposition of the SAMs in a water-free deposition environment, were we able to provide an interface modification that was robust against the ensuing chemical treatments needed in the fabrication of CQD solids. The energy alignment at the rectifying interface was tailored by tuning the R-SAM for optimal alignment relative to the CQD quantum-confined electron energy levels. This resulted in a CQD PV record power conversion efficiency (PCE) of 10.7% with enhanced reproducibility relative to controls.