College of Material Engineering, National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials, Fujian Agriculture and Forestry University, Fuzhou, Fujian, 350108, P. R. China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 350002, Fuzhou, P. R. China.
Adv Sci (Weinh). 2023 Mar;10(8):e2207202. doi: 10.1002/advs.202207202. Epub 2023 Feb 7.
Interfacial engineering is a vital strategy to enable high-performance perovskite solar cells (PSCs). To develop efficient, low-cost, and green biomass interfacial materials, here, a bifunctional cellulose derivative is presented, 6-O-[4-(9H-carbazol-9-yl)butyl]-2,3-di-O-methyl cellulose (C-Cz), with numerous methoxy groups on the backbone and redox-active carbazole units as side chains. The bifunctional C-Cz shows excellent energy level alignment, good thermal stability and strong interactions with the perovskite surface, all of which are critical for not only carrier transportation but also potential defects passivation. Consequently, with C-Cz as the interfacial modifier, the PSCs achieve a remarkably enhanced power conversion efficiency (PCE) of 23.02%, along with significantly enhanced long-term stability. These results underscore the advantages of bifunctional cellulose materials as interfacial layers with effective charge transport properties and strong passivation capability for efficient and stable PSCs.
界面工程是实现高性能钙钛矿太阳能电池（PSC）的重要策略。为了开发高效、低成本和绿色的生物质界面材料，本文提出了一种具有众多甲氧基侧链的双功能纤维素衍生物 6-O-[4-(9H-咔唑-9-基)丁基]-2,3-二-O-甲基纤维素（C-Cz）。双功能 C-Cz 表现出优异的能级排列、良好的热稳定性和与钙钛矿表面的强相互作用，这些对于载流子输运和潜在缺陷钝化都是至关重要的。因此，以 C-Cz 作为界面修饰剂，PSC 的功率转换效率（PCE）显著提高到 23.02%，同时长期稳定性也得到显著增强。这些结果突出了双功能纤维素材料作为界面层的优势，其具有有效的电荷输运性能和强大的钝化能力，可用于高效和稳定的 PSC。
