التفاصيل البيبلوغرافية
| العنوان: |
Quasi‐Homojunction Organic Nonfullerene Photovoltaics Featuring Fundamentals Distinct from Bulk Heterojunctions |
| المؤلفون: |
Wang, Yifan, Price, Michael B., Bobba, Raja Sekhar, Lu, Heng, Xue, Jingwei, Wang, Yilin, Li, Mengyang, Ilina, Aleksandra, Hume, Paul A., Jia, Boyu, Li, Tengfei, Zhang, Yuchen, Davis, Nathaniel J. L. K., Tang, Zheng, Ma, Wei, Qiao, Quinn, Hodgkiss, Justin M., Zhan, Xiaowei |
| المساهمون: |
National Natural Science Foundation of China, China Postdoctoral Science Foundation |
| المصدر: |
Advanced Materials ; volume 34, issue 50 ; ISSN 0935-9648 1521-4095 |
| بيانات النشر: |
Wiley |
| سنة النشر: |
2022 |
| المجموعة: |
Wiley Online Library (Open Access Articles via Crossref) |
| الوصف: |
In contrast to classical bulk heterojunction (BHJ) in organic solar cells (OSCs), the quasi‐homojunction (QHJ) with extremely low donor content (≤10 wt.%) is unusual and generally yields much lower device efficiency. Here, representative polymer donors and nonfullerene acceptors are selected to fabricate QHJ OSCs, and a complete picture for the operation mechanisms of high‐efficiency QHJ devices is illustrated. PTB7‐Th:Y6 QHJ devices at donor:acceptor (D:A) ratios of 1:8 or 1:20 can achieve 95% or 64% of the efficiency obtained from its BHJ counterpart at the optimal D:A ratio of 1:1.2, respectively, whereas QHJ devices with other donors or acceptors suffer from rapid roll‐off of efficiency when the donors are diluted. Through device physics and photophysics analyses, it is observed that a large portion of free charges can be intrinsically generated in the neat Y6 domains rather than at the D/A interface. Y6 also serves as an ambipolar transport channel, so that hole transport as also mainly through Y6 phase. The key role of PTB7‐Th is primarily to reduce charge recombination, likely assisted by enhancing quadrupolar fields within Y6 itself, rather than the previously thought principal roles of light absorption, exciton splitting, and hole transport. |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
English |
| DOI: |
10.1002/adma.202206717 |
| الإتاحة: |
https://doi.org/10.1002/adma.202206717Test |
| حقوق: |
http://onlinelibrary.wiley.com/termsAndConditions#vorTest |
| رقم الانضمام: |
edsbas.4A6A844B |
| قاعدة البيانات: |
BASE |
