Li Mingyu, Chen Shiwu, Zhao Xinzhao, Xiong Kao, Wang Bo, Shah Usman Ali, Gao Liang, Lan Xinzheng, Zhang Jianbing, Hsu Hsien-Yi, Tang Jiang, Song Haisheng
Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei, 430074, P. R. China.
Wenzhou Advanced Manufacturing Technology Research Institute of Huazhong University of Science and Technology, Wenzhou, Zhejiang, P. R. China.
Small. 2022 Jan;18(1):e2105495. doi: 10.1002/smll.202105495. Epub 2021 Dec 2.
Infrared solar cells (IRSCs) can supplement silicon or perovskite SCs to broaden the utilization of the solar spectrum. As an ideal infrared photovoltaic material, PbS colloidal quantum dots (CQDs) with tunable bandgaps can make good use of solar energy, especially the infrared region. However, as the QD size increases, the energy level shrinking and surface facet evolution makes us reconsider the matching charge extraction contacts and the QD passivation strategy. Herein, different to the traditional sol-gel ZnO layer, energy-level aligned ZnO thin film from a magnetron sputtering method is adopted for electron extraction. In addition, a modified hybrid ligand recipe is developed for the facet passivation of large size QDs. As a result, the champion IRSC delivers an open circuit voltage of 0.49 V and a power conversion efficiency (PCE) of 10.47% under AM1.5 full-spectrum illumination, and the certified PCE is over 10%. Especially the 1100 nm filtered efficiency achieves 1.23%. The obtained devices also show high storage stability. The present matched electron extraction and QD passivation strategies are expected to highly booster the IR conversion yield and promote the fast development of new conception QD optoelectronics.
红外太阳能电池（IRSCs）可以补充硅或钙钛矿太阳能电池，以拓宽太阳光谱的利用范围。作为一种理想的红外光伏材料，具有可调带隙的硫化铅胶体量子点（CQDs）可以很好地利用太阳能，特别是红外区域。然而，随着量子点尺寸的增加，能级收缩和表面晶面演化促使我们重新考虑匹配的电荷提取接触和量子点钝化策略。在此，与传统的溶胶 - 凝胶氧化锌层不同，采用磁控溅射法制备的能级对齐的氧化锌薄膜用于电子提取。此外，还开发了一种改进的混合配体配方用于大尺寸量子点的晶面钝化。结果，在AM1.5全光谱光照下，最优的红外太阳能电池开路电压为0.49 V，功率转换效率（PCE）为10.47%，且认证的功率转换效率超过10%。特别是1100 nm滤光效率达到1.23%。所制备的器件还表现出高存储稳定性。目前匹配的电子提取和量子点钝化策略有望大幅提高红外转换效率，并推动新型量子点光电子学的快速发展。
