德国伍珀塔尔大学Riedl, T.团队开发了氧化铟互连的钙钛矿-有机串联太阳能电池。相关研究成果于2022年4月13日发表于国际一流学术期刊《自然》。

多结太阳能电池可以克服单结器件的基本效率限制。金属卤化物钙钛矿型太阳能电池的带隙可调性使其对多结结构具有吸引力。与硅和铜铟硒化镓（CIGS）以及所有钙钛矿串联电池的组合已被报道。同时，窄间隙非富勒烯受体为有机太阳能电池带来了突飞猛进的效率。有机和钙钛矿半导体是一种很有吸引力的组合，具有相似的加工技术。目前，钙钛矿-有机串联显示出低于标准效率，并且受到宽间隙钙钛矿电池的低开路电压（Voc）和亚电池之间互连引入的损耗的限制。

该文中，研究人员展示了钙钛矿-有机串联电池，其效率为24.0%（认证为23.1%），Voc高达2.15V。优化的电荷提取层使钙钛矿亚电池具有高Voc和填充因子的出色组合。有机亚电池在近红外中提供了高的外部量子效率，与非富勒烯电池有限的光稳定性的典型担忧相比，如果激子主要产生于非富勒烯受体上，则表现出出色的操作稳定性，这是它们串联的情况。亚电池由一层超薄（约1.5纳米）的类似金属的氧化铟层连接，具有前所未有的低光/电损耗。

研究工作为钙钛矿-有机化合物串联体系设置了一个里程碑，它优于最佳的Pi-I钙钛矿单结12，与钙钛矿- CIGS和所有钙钛矿多结相当。

附：英文原文

Title: Perovskite–organic tandem solar cells with indium oxide interconnect

Author: Brinkmann, K. O., Becker, T., Zimmermann, F., Kreusel, C., Gahlmann, T., Theisen, M., Haeger, T., Olthof, S., Tckmantel, C., Gnster, M., Maschwitz, T., Gbelsmann, F., Koch, C., Hertel, D., Caprioglio, P., Pea-Camargo, F., Perdign-Toro, L., Al-Ashouri, A., Merten, L., Hinderhofer, A., Gomell, L., Zhang, S., Schreiber, F., Albrecht, S., Meerholz, K., Neher, D., Stolterfoht, M., Riedl, T.

Issue&Volume: 2022-04-13

Abstract: Multijunction solar cells can overcome the fundamental efficiency limits of single-junction devices. The bandgap tunability of metal halide perovskite solar cells renders them attractive for multijunction architectures1. Combinations with silicon and copper indium gallium selenide (CIGS), as well as all-perovskite tandem cells, have been reported2,3,4,5. Meanwhile, narrow-gap non-fullerene acceptors have unlocked skyrocketing efficiencies for organic solar cells6,7. Organic and perovskite semiconductors are an attractive combination, sharing similar processing technologies. Currently, perovskite–organic tandems show subpar efficiencies and are limited by the low open-circuit voltage (Voc) of wide-gap perovskite cells8 and losses introduced by the interconnect between the subcells9,10. Here we demonstrate perovskite–organic tandem cells with an efficiency of 24.0 per cent (certified 23.1 per cent) and a high Voc of 2.15volts. Optimized charge extraction layers afford perovskite subcells with an outstanding combination of high Voc and fill factor. The organic subcells provide a high external quantum efficiency in the near-infrared and, in contrast to paradigmatic concerns about limited photostability of non-fullerene cells11, show an outstanding operational stability if excitons are predominantly generated on the non-fullerene acceptor, which is the case in our tandems. The subcells are connected by an ultrathin (approximately 1.5nanometres) metal-like indium oxide layer with unprecedented low optical/electrical losses. This work sets a milestone for perovskite–organic tandems, which outperform the best p–i–n perovskite single junctions12 and are on a par with perovskite–CIGS and all-perovskite multijunctions13.

DOI: 10.1038/s41586-022-04455-0

Source: https://www.nature.com/articles/s41586-022-04455-0