School of Materials Science and Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China.
School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China.
ACS Appl Mater Interfaces. 2023 Jun 14;15(23):28321-28331. doi: 10.1021/acsami.3c04678. Epub 2023 Jun 2.
To enhance the power conversion efficiency (PCE) and stability of all-polymer solar cells (all-PSCs), a new precursor solution based on an in situ chemical reaction of nanomolybdenum powder (Mo), hydrogen peroxide (HO), and ammonia (NH·HO) was developed for preparing a MoO hole transport layer (HTL) for all-PSCs. The results showed that the PCE and stability of PM6:PY-IT solar cells based on the MoO HTL were better than those based on a PEDOT:PSS layer. To further understand the relationship between the HTL and the device performance, ultrafast photophysical processes of all-PSCs based on different HTLs were contrastively analyzed. Our research indicated that the micromorphology of active layers could be influenced by the interfacial layer material, consequently determining the photoelectric conversion process of all-PSCs. The MoO-based all-PSCs had longer charge lifetime, higher charge mobility, and lower charge recombination characteristics compared with the devices based on the PEDOT:PSS layer during the operation time. As a result, the MoO-based PM6:PY-IT solar cells achieved an initial PCE of 15.2%, and they still maintained more than 80% of their initial efficiency after 1000 h.
为了提高全聚合物太阳能电池（all-PSCs）的功率转换效率（PCE）和稳定性，开发了一种基于纳米钼粉（Mo）、过氧化氢（HO）和氨（NH·HO）原位化学反应的新型前体溶液，用于制备全聚合物太阳能电池的 MoO 空穴传输层（HTL）。结果表明，基于 MoO HTL 的 PM6:PY-IT 太阳能电池的 PCE 和稳定性优于基于 PEDOT:PSS 层的太阳能电池。为了进一步了解 HTL 与器件性能之间的关系，对比分析了基于不同 HTL 的全聚合物太阳能电池的超快光物理过程。我们的研究表明，活性层的微形貌可以受到界面层材料的影响，从而决定全聚合物太阳能电池的光电转换过程。与基于 PEDOT:PSS 层的器件相比，基于 MoO 的全聚合物太阳能电池在工作时间内具有更长的电荷寿命、更高的电荷迁移率和更低的电荷复合特性。因此，基于 MoO 的 PM6:PY-IT 太阳能电池的初始 PCE 达到了 15.2%，并且在 1000 小时后仍保持其初始效率的 80%以上。
