Kato Masahiro, Yoshizawa Hayato, Nakaya Masato, Kitagawa Yasutaka, Okamoto Koichi, Yamada Tomoaki, Yoshino Masahito, Tanaka Kentaro, Onoe Jun
Department of Energy Science and Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan.
Graduate School of Engineering Science, Osaka University, Machikaneyama, Toyonaka, Osaka, 560-8531, Japan.
Sci Rep. 2022 May 25;12(1):8810. doi: 10.1038/s41598-022-12990-z.
Lead phthalocyanine (PbPc) is well known to be used as a good near-infrared (NIR) light absorber for organic solar cells (OSCs) and photodetectors. The monoclinic and triclinic phases have been understood to absorb the visible and NIR regions, respectively, so far. In the present study, we demonstrated from the absorption spectra and theoretical analysis that the visible band considerably originates from not only the monoclinic but also the amorphous and triclinic phases, and revealed the exciton dynamics in the PbPc film from static/time-resolved photoluminescence (PL), which are first reported. By comparing the external quantum efficiency between PbPc- and ZnPc-based OSCs in relation to their structure, morphology, and optical (absorption and PL) characteristics, we unraveled the reasons behind the PbPc film used as a good absorber for NIR-sensitive devices.
众所周知，铅酞菁（PbPc）被用作有机太阳能电池（OSC）和光电探测器的优良近红外（NIR）光吸收剂。到目前为止，人们认为单斜相和三斜相分别吸收可见光和近红外区域。在本研究中，我们通过吸收光谱和理论分析证明，可见带不仅相当程度上源于单斜相，还源于非晶相和三斜相，并首次从静态/时间分辨光致发光（PL）揭示了PbPc薄膜中的激子动力学。通过比较基于PbPc和ZnPc的OSC之间的外量子效率与其结构、形态和光学（吸收和PL）特性，我们揭示了PbPc薄膜用作近红外敏感器件优良吸收剂背后的原因。
