报告题目：Interface Engineering and Flexible Device for High-efficiency PerovskiteSolar Cells
报 告 人: 李耀文副教授
报告时间: 2016年3月3日14:00 - 15:00
报告地点: 907-1445
个人简介:
2001-2005年 吉林大学，学士；
2005-2010年 吉林大学，博士；
2011-2014年 中国科学院苏州纳米技术与纳米仿生研究所，博士后；
2015.1-2016.1年 加州大学洛杉矶分校（UCLA）， 访问学者；
2010-至今 苏州大学，材料与化学化工学部， 副教授。
Abstract: Wide applications of personal consumer electronics havetriggered tremendous need for portable power sources featuring light-weight andmechanical flexibility. Perovskite solar cells offer a compelling combinationof low-cost and high device performance. However, there are several challengingissues should be addressed.
Firstly, in perovskite based planar heterojunction solar cells, theinterface between the TiO2 compact layer and the perovskite film iscritical for high photovoltaic performance. The deep trap states on the TiO2 surface induce several challenging issues, such as charge recombination lossand poor stability etc. To solve the problems, we synthesized a triblock fullerenederivative (PCBB-2CN-2C8) via rational molecular design for interfaceengineering in the perovskite solar cells. Modifying the TiO2 surface with the compound significantly improves charge extraction from theperovskite layer. Together with its uplifted surface work function, opencircuit voltage and fill factor are dramatically increased from 0.99 to 1.06 V,and from 72.2% to 79.1%, respectively, resulting in 20.7% improvement in powerconversion efficiency for the best performing devices.
Secondly, we demonstrate high-performance planar heterojunction perovskitesolar cells constructed on highly flexible and ultrathin silver-mesh/conductingpolymer substrates. The device performance is comparable to that of theircounterparts on rigid glass/indium tin oxide substrates, reaching a powerconversion efficiency of 14.0%, while the specific power (the ratio of power todevice weight) reaches 1.96 kW kg-1, given the fact that the deviceis constructed on a 57-mm-thick polyethyleneterephthalate based substrate. The flexible device also demonstrates excellentrobustness against mechanical deformation, retaining 95% of its original efficiencyafter 5,000 times fully bending. Our results confirmed that perovskite thinfilms are fully compatible with our flexible substrates, and are thus promisingfor future applications in flexible and bendable solar cells.