Abstract
Employing a photosensitive donor/acceptor planar heterojunction (DA-PHJ) with complementary optical absorption as the active layer is one of the key strategies for realizing broad spectral organic photodiodes (BS-OPDs). To achieve superior optoelectronic performance, it is vital to optimize the thickness ratio of the donor layer to acceptor layer (the DA thickness ratio) in addition to the optoelectronic properties of the DA-PHJ materials. In this study, we realized a BS-OPD exploiting tin(II) phthalocyanine (SnPc)/3,4,9,10-perylenete-acarboxylic dianhydride (PTCDA) as the active layer and investigated the effect of the DA thickness ratio on the device performance. The results showed that the DA thickness ratio has a significant impact on the device performance, and an optimized DA thickness ratio of 30:20 was found. Upon the optimization of the DA thickness ratio, improvements of 187% in photoresponsivity and 144% in specific detectivity were achieved on average. Trap-free space-charge-limited photocarrier transport and balanced optical absorption over the wavelength range can be ascribed to the improved performance at the optimized DA thickness ratio. These results establish a solid photophysical foundation for improving the performance of BS-OPDs via thickness ratio optimization.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Kunpeng Hu, Haochen Zhang, Fangzhou Liang, Yifu Guo, Junyang Deng, Kun Liang, Zhanyong Xing, Hu Wang, Mingshuo Zhang, Mengmeng Li, and Haiding Sun
Opt. Lett. 48(21) 5575-5578 (2023)
Yuhao Li, Dan Zhao, Dayong Zhang, Mengge Wu, Yuzhe Liu, and Junsheng Yu
Opt. Lett. 47(13) 3375-3378 (2022)
Kanglong Xia, Zeng Liu, Shulin Sha, Zhaoying Xi, Jia-Han Zhang, Mingming Jiang, Yufeng Guo, and Weihua Tang
Opt. Lett. 48(24) 6384-6387 (2023)