Intrinsic Polarization-Sensitive Organic Photodetector with Self-Assembled All-Polymer Heterojunction

in: Applied Physics Letters (2022)
Täuber, Daniela; Cai, Wanzhu; Scheblykin, Ivan G.; Luo, Xuhao; Xue, Yingying; Wu, Juntao; Malovichko, Ivan; Sava, Bogdan; Cen, Guobiao; Lu, Xing; Zhao, Chuanxi; Yu, Jianhui; Mai, Wenjie; Liu, Feng; Wang, Ergang; Hou, Lintao
Intrinsic polarization-sensitive photodetectors (IPPDs) have attracted considerable attention in recent years due to their simplicity in configuration, making them ideal candidates for compact and integrated polarization-sensitive sensing and imaging systems. Photoactive films with intrinsic optical anisotropy are necessary for IPPDs. This study reports an achievement of photoactive films based on all-polymer heterojunction films with in-plane optical anisotropy using a simple bottom-up self-assembly method. Both the donor (TQ1) and acceptor (N2200) polymers have the same spatial orientation with distinct anisotropy, approaching a dichroic ratio (DR) of 8. Polarization-sensitive light absorption is due to the uniaxially oriented polymer chains, which are dominated by lamellar packing with edge-on orientation. For IPPDs based on this anisotropic all-polymer heterojunction film, a photocurrent anisotropy was found with a polarized photocurrent ratio of 2.6. The detectivity of these IPPDs was found to be 1.9_1011 Jones (@ _600 nm, 0V bias). Our work shows that oriented polymer donor–acceptor films fabricated using bottom-up self-assembly have great potential in applications, such as polarization detection.

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