Ren Hao, Chen Jing-De, Zhang Ye-Fan, Zhang Jia-Liang, Chen Wei-Shuo, Li Yan-Qing, Tang Jian-Xin
Macao Institute of Materials Science and Engineering (MIMSE), Faculty of Innovation Engineering (FIE), Macau University of Science and Technology, Taipa, Macao SAR 999078, China.
Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China.
Sci Adv. 2024 Nov;10(44):eadp9439. doi: 10.1126/sciadv.adp9439. Epub 2024 Nov 1.
Highly efficient bifacial organic solar cells (OSCs) have not been reported due to limited thickness of the active layer in conventional configurations, not allowing for efficient harvesting of front sunlight and albedo light. Here, bifacial OSCs are reported with efficiency higher than the monofacial counterparts. The incorporation of pyramid-based asymmetrical optical transmission (AOT) array to a transparent silver electrode suppresses the escaping of front sunlight without sacrificing the harvesting of albedo light. Parasitic absorption induced by the excitation of surface plasmons in an AOT electrode is further reduced by doping organic emitter in electron transport layer and capping high dielectric constant film to silver. The rear electrode achieves a front transmittance of 7% and a rear transmission of 86%. At a conventional albedo of 0.2, the synergistic effect of AOT and minimized optical loss endow the bifacial OSCs with power conversion efficiency of 20.4%. This work paves the way for the utilization of albedo light in OSCs.
由于传统结构中活性层厚度有限，无法有效收集正面阳光和反照光，因此尚未报道过高效率的双面有机太阳能电池（OSC）。在此，报道了双面OSC，其效率高于单面同类产品。将基于金字塔的不对称光传输（AOT）阵列并入透明银电极可抑制正面阳光的逸出，同时不影响反照光的收集。通过在电子传输层中掺杂有机发射体并在银上覆盖高介电常数薄膜，进一步降低了AOT电极中表面等离子体激元激发引起的寄生吸收。背面电极的正面透过率为7%，背面透过率为86%。在传统反照率为0.2的情况下，AOT的协同效应和最小化的光损耗使双面OSC的功率转换效率达到20.4%。这项工作为OSC中反照光的利用铺平了道路。
