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Exfoliated Fluorographene Quantum Dots as Outstanding Passivants for Improved Flexible Perovskite Solar Cells.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-05-06 , DOI: 10.1021/acsami.0c04975 Longkai Yang , Yiwen Li , Luyao Wang , Yaxi Pei , Zeyu Wang , Yan Zhang , Hong Lin 1 , Xin Li
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-05-06 , DOI: 10.1021/acsami.0c04975 Longkai Yang , Yiwen Li , Luyao Wang , Yaxi Pei , Zeyu Wang , Yan Zhang , Hong Lin 1 , Xin Li
Affiliation
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Flexible perovskite solar cells (PSCs) are currently one of the most attractive flexible thin-film photovoltaic technologies. Despite achieving remarkable progress in power conversion efficiencies (PCEs), flexible PSCs have not yet kept pace with rigid PSCs. Defect passivation is of crucial importance to further enhance the PCEs of flexible PSCs. Here, highly dispersed fluorographene quantum dots (FGQDs) are exfoliated from graphite fluoride with the aid of stirring and sonication and used to passivate the grain boundaries and surface of the perovskite films for high-performance flexible PSCs. Photoluminescence spectroscopy (PL) and time-resolved PL decays indicate that the FGQDs are beneficial for suppressing carrier recombination. Space-charge-limited current measurements prove that the passivated perovskite film exhibits reduced trap densities. As a result, a best PCE of 20.40% is achieved from the flexible PSCs, owing to significantly reduced charge recombination. Moreover, the champion device delivers an outstanding steady-state PCE exceeding 20%. The flexible PSCs with the FGQDs also exhibit enhanced thermal stability and environmental stability. Our work not only highlights the importance of passivating the defects within the perovskite films for high-efficiency flexible PSCs but also offers a promising future for the commercialization of flexible PSCs.
中文翻译：
脱落的氟代石墨烯量子点可作为改进的柔性钙钛矿太阳能电池的出色钝化剂。
柔性钙钛矿太阳能电池（PSC）是目前最有吸引力的柔性薄膜光伏技术之一。尽管在功率转换效率（PCE）方面取得了显着进步，但灵活的PSC尚未与刚性PSC保持同步。缺陷钝化对于进一步增强柔性PSC的PCE至关重要。此处，借助搅拌和超声处理，从氟化石墨中剥落了高度分散的氟石墨烯量子点（FGQD），并用于钝化高性能柔性PSC的钙钛矿薄膜的晶界和表面。光致发光光谱法（PL）和时间分辨的PL衰减表明FGQD对于抑制载流子重组是有益的。空间电荷限制的电流测量结果证明，钝化的钙钛矿膜表现出降低的陷阱密度。结果，由于显着减少了电荷重组，因此柔性PSC可获得20.40％的最佳PCE。此外，冠军设备可提供超过20％的出色稳态PCE。具有FGQD的柔性PSC还具有增强的热稳定性和环境稳定性。我们的工作不仅强调钝化钙钛矿薄膜中的缺陷对于高效柔性PSC的重要性，而且为柔性PSC的商业化提供了广阔的前景。
更新日期：2020-04-28
中文翻译：
脱落的氟代石墨烯量子点可作为改进的柔性钙钛矿太阳能电池的出色钝化剂。
柔性钙钛矿太阳能电池（PSC）是目前最有吸引力的柔性薄膜光伏技术之一。尽管在功率转换效率（PCE）方面取得了显着进步，但灵活的PSC尚未与刚性PSC保持同步。缺陷钝化对于进一步增强柔性PSC的PCE至关重要。此处，借助搅拌和超声处理，从氟化石墨中剥落了高度分散的氟石墨烯量子点（FGQD），并用于钝化高性能柔性PSC的钙钛矿薄膜的晶界和表面。光致发光光谱法（PL）和时间分辨的PL衰减表明FGQD对于抑制载流子重组是有益的。空间电荷限制的电流测量结果证明，钝化的钙钛矿膜表现出降低的陷阱密度。结果，由于显着减少了电荷重组，因此柔性PSC可获得20.40％的最佳PCE。此外，冠军设备可提供超过20％的出色稳态PCE。具有FGQD的柔性PSC还具有增强的热稳定性和环境稳定性。我们的工作不仅强调钝化钙钛矿薄膜中的缺陷对于高效柔性PSC的重要性，而且为柔性PSC的商业化提供了广阔的前景。
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