Divalent cation replacement strategy stabilizes wide-bandgap perovskite for Cu(In,Ga)Se2 tandem solar cells

IF 32.3 1区 物理与天体物理 Q1 OPTICS
Liuwen Tian, Enbing Bi, Ilhan Yavuz, Caner Deger, Yuan Tian, Jingjing Zhou, Shaochen Zhang, Qingqing Liu, Jiahui Shen, Libing Yao, Ke Zhao, Jiazhe Xu, Zhong Chen, Lingyu Xiao, Zhen Yang, Pengju Shi, Xu Zhang, Sisi Wang, Shenglong Chu, Mustafa Haider, Jingjing Xue, Rui Wang
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Abstract

Despite improvements in the power conversion efficiency (PCE) of perovskite solar cells (PSCs), stability issues due to ion migration and phase separation remain critical concerns. Given the ionic crystal nature of perovskites, the use of multivalent cations is supposed to effectively suppress ionic migration. However, multivalent metal cations produce deep-level trap states, thus impairing device efficiency. Therefore, a multivalent cation replacement strategy that minimizes interstitial defects is desirable. Here we develop a divalent cation replacement strategy that mitigates ionic migration while limiting phase segregation. We demonstrate that the replacement of the A-site cations in the perovskite lattice with methylenediammonium cations (MDA2+) substantially suppresses the above issues in wide-bandgap perovskites. This is mainly due to the bivalent state of MDA2+ generating a strong interaction with the inorganic framework and reducing the mobility of halide ions and the formation of defects. As a result, the stability and efficiency of the fabricated PSCs are substantially improved. We demonstrate a champion PCE of 23.20% (certified 22.71%) for a single-junction PSC with a bandgap between 1.67 eV and 1.68 eV. Furthermore, a PCE of 30.13% is obtained for mechanically stacked perovskite/Cu(In,Ga)Se2 tandem devices, and a PCE of 21.88% for translucent perovskite devices. Finally, we obtain a steady-state PCE of 23.28% (certified 22.79%) for flexible monolithic perovskite/Cu(In,Ga)Se2 tandem cells.

Abstract Image

二价阳离子替代策略稳定Cu(In,Ga)Se2串联太阳能电池宽禁带钙钛矿
尽管钙钛矿太阳能电池(PSCs)的功率转换效率(PCE)有所提高,但离子迁移和相分离引起的稳定性问题仍然是关键问题。考虑到钙钛矿的离子晶体性质,多价阳离子的使用被认为可以有效地抑制离子迁移。然而,多价金属阳离子产生深能级阱态,从而损害器件效率。因此,多价阳离子替代策略,以尽量减少间质缺陷是可取的。在这里,我们开发了一种二价阳离子替代策略,减轻离子迁移,同时限制相分离。我们证明,用亚二铵离子(MDA2+)取代钙钛矿晶格中的a位阳离子可以有效地抑制宽带隙钙钛矿中的上述问题。这主要是由于MDA2+的二价态与无机骨架产生了强烈的相互作用,降低了卤化物离子的迁移率和缺陷的形成。结果表明,制备的PSCs的稳定性和效率得到了显著提高。我们展示了带隙在1.67 eV和1.68 eV之间的单结PSC的冠军PCE为23.20%(认证22.71%)。此外,机械堆叠钙钛矿/Cu(In,Ga)Se2串联器件的PCE为30.13%,半透明钙钛矿器件的PCE为21.88%。最后,我们获得了柔性单片钙钛矿/Cu(In,Ga)Se2串联电池的稳态PCE为23.28%(经认证为22.79%)。
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来源期刊
Nature Photonics
Nature Photonics 物理-光学
CiteScore
54.20
自引率
1.70%
发文量
158
审稿时长
12 months
期刊介绍: Nature Photonics is a monthly journal dedicated to the scientific study and application of light, known as Photonics. It publishes top-quality, peer-reviewed research across all areas of light generation, manipulation, and detection. The journal encompasses research into the fundamental properties of light and its interactions with matter, as well as the latest developments in optoelectronic devices and emerging photonics applications. Topics covered include lasers, LEDs, imaging, detectors, optoelectronic devices, quantum optics, biophotonics, optical data storage, spectroscopy, fiber optics, solar energy, displays, terahertz technology, nonlinear optics, plasmonics, nanophotonics, and X-rays. In addition to research papers and review articles summarizing scientific findings in optoelectronics, Nature Photonics also features News and Views pieces and research highlights. It uniquely includes articles on the business aspects of the industry, such as technology commercialization and market analysis, offering a comprehensive perspective on the field.
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