Ho Nhu Thuy, Tien Huynh Ngoc, Jang Se-Joeng, Senthilkumar Velusamy, Park Yun Chang, Cho Shinuk, Kim Yong Soo
Department of Physics and Energy Harvest Storage Research Center, University of Ulsan, Ulsan 44610, S. Korea.
Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, USA.
Sci Rep. 2016 Jul 25;6:30327. doi: 10.1038/srep30327.
High performance of organic tandem solar cell is largely dependent on transparent and conductive intermediate layer (IML). The current work reports the design and fabrication of an IML using a simple solution process. The efficiency of a homo-tandem device with poly(3-hexylthiophene):phenyl-C61-butyric acid methyl ester as an active layer and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/poly(ethylenimine) as an IML was initially found to be 3.40%. Further enhancement of the cell efficiency was achieved using silver nanoparticles (Ag-NPs) of different sizes and graphene quantum dot embedded IML. A maximum efficiency of 4.03% was achieved using 7 nm Ag-NPs that contribute to a better recombination process. Also, the performance of the tandem cell was solely based on the electrical improvements indicated by the current - voltage measurements, external quantum efficiency and impedance analysis. The use of Ag-NPs in the IML has been shown to lengthen the life time of electron-hole pairs in the device. This study thus paves way to develop such efficient IMLs for more efficient tandem solar cells.
有机串联太阳能电池的高性能在很大程度上取决于透明导电中间层（IML）。当前工作报道了一种采用简单溶液法制备IML的设计与制造。以聚（3-己基噻吩）：苯基-C61-丁酸甲酯作为活性层、聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）/聚（乙二胺）作为IML的均相串联器件，其初始效率被发现为3.40%。使用不同尺寸的银纳米颗粒（Ag-NPs）和嵌入石墨烯量子点的IML实现了电池效率的进一步提高。使用有助于更好复合过程的7纳米Ag-NPs实现了4.03%的最大效率。此外，串联电池的性能完全基于电流-电压测量、外量子效率和阻抗分析所表明的电学性能提升。已证明在IML中使用Ag-NPs可延长器件中电子-空穴对的寿命。因此，本研究为开发用于更高效串联太阳能电池的此类高效IML铺平了道路。
