德国柏林科技大学的Steve Albrecht研究团队开发了一种单片钙钛矿/硅串联太阳能电池，通过提高空穴提取功率转换效率高达29%。 该研究成果于2020年发表在国际顶尖学术期刊《科学》。

将硅与金属卤化物钙钛矿配对的串联太阳能电池是突破单电池效率极限的一个很有前途的选择。

该文中，研究人员开发一种整体钙钛矿/硅串列，其功率转换效率为29.15%。钙钛矿吸收材料的带隙为1.68eV，通过空穴选择界面处的快速空穴提取和最小化的非辐射复合，其在光照下保持了相位稳定。

这些特性是由自组装的甲基取代咔唑单层膜作为钙钛矿电池中的空穴选择层而实现的。加速空穴提取与1.26的低理想系数和高达84%的单结填充系数有关，同时使串联开路电压高达1.92V。在空气中，没有封装，串联运行300小时后仍保持95%的初始效率。

附：英文原文

Title: Monolithic perovskite/silicon tandem solar cell with >29% efficiency by enhanced hole extraction

Author: Amran Al-Ashouri, Eike Khnen, Bor Li, Artiom Magomedov, Hannes Hempel, Pietro Caprioglio, José A. Márquez, Anna Belen Morales Vilches, Ernestas Kasparavicius, Joel A. Smith, Nga Phung, Dorothee Menzel, Max Grischek, Lukas Kegelmann, Dieter Skroblin, Christian Gollwitzer, Tadas Malinauskas, Marko Jot, Gaper Mati, Bernd Rech, Rutger Schlatmann, Marko Topi, Lars Korte, Antonio Abate, Bernd Stannowski, Dieter Neher, Martin Stolterfoht, Thomas Unold, Vytautas Getautis, Steve Albrecht

Issue&Volume: 2020/12/11

Abstract: Tandem solar cells that pair silicon with a metal halide perovskite are a promising option for surpassing the single-cell efficiency limit. We report a monolithic perovskite/silicon tandem with a certified power conversion efficiency of 29.15%. The perovskite absorber, with a bandgap of 1.68 electron volts, remained phase-stable under illumination through a combination of fast hole extraction and minimized nonradiative recombination at the hole-selective interface. These features were made possible by a self-assembled, methyl-substituted carbazole monolayer as the hole-selective layer in the perovskite cell. The accelerated hole extraction was linked to a low ideality factor of 1.26 and single-junction fill factors of up to 84%, while enabling a tandem open-circuit voltage of as high as 1.92 volts. In air, without encapsulation, a tandem retained 95% of its initial efficiency after 300 hours of operation.

DOI: 10.1126/science.abd4016

Source: https://science.sciencemag.org/content/370/6522/1300