Highly Efficient Perovskite-Perovskite Tandem Solar Cells Reaching 80% of the Theoretical Limit in Photovoltage
Highly Efficient Perovskite-Perovskite Tandem Solar Cells Reaching 80% of the Theoretical Limit in Photovoltage
复制标题
DOI：
10.1002/adma.201702140
复制
发表时间：
2017-09-13
影响因子：
29.4
通讯作者：
Jen, Alex K. -Y.
中科院分区：
文献类型：
--
作者：
Rajagopal, Adharsh;Yang, Zhibin;Jen, Alex K. -Y.
有机-无机混合钙钛矿多结太阳能电池具有实现超过单结太阳能电池的Shockley-Queisser极限的功率转换效率（PCE）的巨大潜力;然而，它们受到小带隙和大带隙子电池中的大的非理想光电压损耗（V-oc，V-loss）的限制。在这里，一个集成的方法被用来提高具有优化的带隙的子电池的V-oc和制造具有小的V-oc，V-loss的钙钛矿-钙钛矿叠层太阳能电池。一种富勒烯变体，茚-C-60双加合物，用于在小带隙中实现优化的界面接触。（约1.2eV）子电池，其促进更高的准费米能级分裂，减少非辐射复合，消除滞后不稳定性，并将V-oc提高到0.84 V。采用（约1.8eV）钙钛矿来实现具有透明顶部电极和1.22V的光稳定V-oc的子电池。所得单片钙钛矿-钙钛矿串联太阳能电池显示出1.98V的高V-oc（接近理论限值的80%）和18.5%的稳定PCE。显著最小化的非理想V-oc，V-loss优于现有技术的硅-钙钛矿串联太阳能电池，这突出了使用钙钛矿-钙钛矿串联用于太阳能发电的前景。它还开启了使用混合钙钛矿进行太阳能水分解的机会，太阳能-氢气效率超过15%。
Organic-inorganic hybrid perovskite multijunction solar cells have immense potential to realize power conversion efficiencies (PCEs) beyond the Shockley-Queisser limit of single-junction solar cells; however, they are limited by large nonideal photovoltage loss (V-oc,V-loss) in small- and large-bandgap subcells. Here, an integrated approach is utilized to improve the V-oc of subcells with optimized bandgaps and fabricate perovskite-perovskite tandem solar cells with small V-oc,V-loss. A fullerene variant, Indene-C-60 bis-adduct, is used to achieve optimized interfacial contact in a small-bandgap (approximate to 1.2 eV) subcell, which facilitates higher quasi-Fermi level splitting, reduces nonradiative recombination, alleviates hysteresis instabilities, and improves V-oc to 0.84 V. Compositional engineering of large-bandgap (approximate to 1.8 eV) perovskite is employed to realize a subcell with a transparent top electrode and photostabilized V-oc of 1.22 V. The resultant monolithic perovskite-perovskite tandem solar cell shows a high V-oc of 1.98 V (approaching 80% of the theoretical limit) and a stabilized PCE of 18.5%. The significantly minimized nonideal V-oc,V-loss is better than state-of-the-art silicon-perovskite tandem solar cells, which highlights the prospects of using perovskite-perovskite tandems for solar-energy generation. It also unlocks opportunities for solar water splitting using hybrid perovskites with solar-to-hydrogen efficiencies beyond 15%.