Lin Hao-Sheng, Lee Jong-Min, Han Jiye, Lee Changsoo, Seo Seungju, Tan Shaun, Lee Hyuck Mo, Choi Eun Jung, Strano Michael S, Yang Yang, Maruyama Shigeo, Jeon Il, Matsuo Yutaka, Oh Jin-Woo
Department of Mechanical Engineering School of Engineering The University of Tokyo Tokyo 113-8656 Japan.
Department of Chemical Engineering Massachusetts Insititute of Techonology Cambridge MA 02139 USA.
Adv Sci (Weinh). 2020 Aug 5;7(20):2000782. doi: 10.1002/advs.202000782. eCollection 2020 Oct.
The M13 bacteriophage, a nature-inspired environmentally friendly biomaterial, is used as a perovskite crystal growth template and a grain boundary passivator in perovskite solar cells. The amino groups and carboxyl groups of amino acids on the M13 bacteriophage surface function as Lewis bases, interacting with the perovskite materials. The M13 bacteriophage-added perovskite films show a larger grain size and reduced trap-sites compared with the reference perovskite films. In addition, the existence of the M13 bacteriophage induces light scattering effect, which enhances the light absorption particularly in the long-wavelength region around 825 nm. Both the passivation effect of the M13 bacteriophage coordinating to the perovskite defect sites and the light scattering effect intensify when the M13 virus-added perovskite precursor solution is heated at 90 °C prior to the film formation. Heating the solution denatures the M13 bacteriophage by breaking their inter- and intra-molecular bondings. The denatured M13 bacteriophage-added perovskite solar cells exhibit an efficiency of 20.1% while the reference devices give an efficiency of 17.8%. The great improvement in efficiency comes from all of the three photovoltaic parameters, namely short-circuit current, open-circuit voltage, and fill factor, which correspond to the perovskite grain size, trap-site passivation, and charge transport, respectively.
M13噬菌体是一种受自然启发的环保生物材料，被用作钙钛矿晶体生长模板和钙钛矿太阳能电池中的晶界钝化剂。M13噬菌体表面氨基酸的氨基和羧基作为路易斯碱，与钙钛矿材料相互作用。与参考钙钛矿薄膜相比，添加M13噬菌体的钙钛矿薄膜显示出更大的晶粒尺寸和减少的陷阱位点。此外，M13噬菌体的存在会引起光散射效应，这尤其增强了在825nm左右长波长区域的光吸收。当在成膜之前将添加M13病毒的钙钛矿前驱体溶液在90℃加热时，M13噬菌体与钙钛矿缺陷位点配位的钝化效应和光散射效应都会增强。加热溶液会通过破坏其分子间和分子内键合使M13噬菌体变性。添加变性M13噬菌体的钙钛矿太阳能电池的效率为20.1%，而参考器件的效率为17.8%。效率的大幅提高来自所有三个光伏参数，即短路电流、开路电压和填充因子，它们分别对应于钙钛矿晶粒尺寸、陷阱位点钝化和电荷传输。
