Liu Sisi, Wang Meng, Luo Tianyu, Wei Aoshen, Li Ming-Yu, Lu Haifei, Wen Xiaoyan
School of Science, Wuhan University of Technology, Wuhan, Hubei 430070, China.
Yangtzi Delta Region Institute of University of Electronic Science and Technology of China, Huzhou, Zhejiang 313098, China.
J Phys Chem Lett. 2024 Aug 22;15(33):8427-8433. doi: 10.1021/acs.jpclett.4c02080. Epub 2024 Aug 8.
Infrared solar cells (IRSCs), capable of converting low-energy infrared photons to electron-hole pairs, are promising infrared optoelectronic devices because of their extended utilization region of the solar to short-wavelength infrared region. For PbS QDs IRSCs, charge extraction loss, easily generated at the interfaces, has been one of the dominate obstacles impeding the improvement of device efficiencies due to too many trap states and mismatched energy levels between the photoactive layer and electron transport layer (ETL). Herein, an advanced ZnO ETL was developed to improve the extraction of photogenerated charges from the PbS QD photoactive layer to ETLs. The advanced ETL film exhibited effectively suppressed trap states and better-matched energy levels compared with the QD layer. As a consequence, high-performance PbS QD IRSCs with the highest infrared power conversion efficiencies of 1.26% under 1100 nm filtered solar illumination are achieved, suggesting an effective and facile route for enhancing the charge extraction in infrared photovoltaics.
红外太阳能电池（IRSCs）能够将低能量红外光子转换为电子-空穴对，由于其将太阳能的利用范围扩展到短波长红外区域，因此是很有前景的红外光电器件。对于硫化铅量子点红外太阳能电池，由于光活性层与电子传输层（ETL）之间存在过多的陷阱态和不匹配的能级，在界面处容易产生电荷提取损失，这一直是阻碍器件效率提高的主要障碍之一。在此，开发了一种先进的氧化锌电子传输层，以改善光生电荷从硫化铅量子点光活性层到电子传输层的提取。与量子点层相比，先进的电子传输层薄膜表现出有效抑制的陷阱态和更匹配的能级。结果，实现了高性能的硫化铅量子点红外太阳能电池，在1100nm滤光太阳光照下具有1.26%的最高红外功率转换效率，这表明了一种有效且简便的途径来增强红外光伏中的电荷提取。
