Kim Jaehoon, Sarker Ashis K, Park Yeseul, Kwak Jeonghun, Song Hyung-Jun, Lee Changhee
Department of Electrical and Computer Engineering, Seoul National University Seoul 08826 Republic of Korea
Department of Chemistry, Mawlana Bhashani Science and Technology University Tangail-1902 Bangladesh.
RSC Adv. 2021 Aug 12;11(44):27199-27206. doi: 10.1039/d1ra02452c. eCollection 2021 Aug 9.
The development of an efficient and stable hole extraction layer (HEL) is crucial for commercializing organic solar cells (OSCs). Although a few candidates have been widely utilized as HELs for OSCs, the most appropriate material has been lacking. A few articles have recently reported graphene oxide (GO) as a well-working HEL that offers comparable performance to conventional HELs. However, a systematic study providing comprehensive insight into the GO-based OSC behavior is lacking. This article discusses broad topics, including the material properties, device efficiency, shelf lifetime, and impedance properties. We found that GO offers excellent properties, which are identical to those of conventional HELs, while the shelf lifetime shows a significant 6-fold increase. Furthermore, we discuss the significantly reduced space-charge limited region of an aged GO-based OSC compared with a PEDOT:PSS-based device, which is revealed to be a reason for the different shelf lifetime. We believe that the results will accelerate the development of GO as an HEL for OSCs and other optoelectronic devices.
开发高效稳定的空穴提取层（HEL）对于有机太阳能电池（OSC）的商业化至关重要。尽管有几种材料已被广泛用作OSC的HEL，但一直缺乏最合适的材料。最近有几篇文章报道氧化石墨烯（GO）是一种性能良好的HEL，其性能与传统HEL相当。然而，目前缺乏对基于GO的OSC行为进行全面深入研究的系统性研究。本文讨论了广泛的主题，包括材料特性、器件效率、储存寿命和阻抗特性。我们发现GO具有优异的特性，与传统HEL相同，同时储存寿命显著提高了6倍。此外，我们讨论了与基于PEDOT:PSS的器件相比，老化的基于GO的OSC的空间电荷限制区域显著减小，这被认为是储存寿命不同的原因。我们相信这些结果将加速GO作为OSC和其他光电器件的HEL的开发。
