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南昌大学何家成、郭钊等人的最新 Nature Energy:有机铯盐实现 α-FA-Cs 钙钛矿中受控 Cs+ 掺入,认证效率达 26.61%

  • 2026-04-19 05:02:21
南昌大学何家成、郭钊等人的最新 Nature Energy:有机铯盐实现 α-FA-Cs 钙钛矿中受控 Cs+ 掺入,认证效率达 26.61%

  本文针对两步法 FA1-xCsxPbI3钙钛矿中“Cs+难掺入、阳离子分布不均、δ-CsPbI3易析出的核心痛点,设计有机铯盐DPPBCscaesium 4-(diphenylphosphino)benzoate)。DPPBCs 借助膦配位基与PbI的强相互作用,同时实现抑制δ-CsPbI3、促进 Cs有效掺杂和均匀分布、并降低缺陷密度。最终器件实现 26.91% 冠军效率和26.61% 认证效率;采用热稳定PTAA 后,在85 °C1-sunMPP 跟踪1500 h 后仍保持初始效率的95%

一、研究背景与核心挑战

  • 两步法更适合制造放大,因为成核和晶体生长被解耦,薄膜均匀性与重现性更好;但α-FAPbI在室温下易转为失活的δ 相,稳定性仍是商业化的关键障碍。

  • 对两步法 FACs 体系而言,直接把CsI 掺入PbI前驱体会受到 CsX 溶解度低与δ-CsPbI3先期生成的双重限制,结果是 Cs+实际掺入不足、组分不均并诱发相分离。

  • 作者通过 DFT 进一步说明:Cs掺杂把α→δ 相变能垒从0.645 eV 提升到0.755 eV,同时抑制[PbI6]4−八面体摆动并约束 FA+重排,FA+旋转自相关时间由 2.3 ps 延长到5.2 ps

二、解决方案:DPPBCs 促进受控 Cs+ 掺杂与均匀分布

  • DPPBCs caesium 4-(diphenylphosphino)benzoate。其设计关键在于用含P Lewis 碱位点与未配位Pb 原子相互作用,在PbI阶段打断δ-CsPbI3 的形成路径,再把Cs+更温和、更均匀地带入钙钛矿晶格。

  • 与直接 CsI 掺杂相比,DPPBCs 体系获得更低的成膜反应焓(-1.46 eV per unit),并消除了δ-CsPbI3和残余 PbI2问题;ToF-SIMS HAADF-STEM 进一步证明FA+/Cs+沿厚度方向分布更均匀,d(200) 从表面到底部几乎保持一致。

性能指标

Control

PVK-CsI

PVK-DPPBCs

反应焓 / eV per unit

0.15

-1.38

-1.46

反扫 PCE

24.86%

25.56%

26.91%

VOC

1.161 V

1.168 V

1.180 V

FF

81.26%

83.53%

86.11%

TRPL 寿命

179.20 ns

346.19 ns

818.67 ns

1500 h ISOS-L-2 保持率

66%

81%

95%

三、研究亮点

  • 从热力学与动力学两端解释 Cs稳相机制Cs缩小并稳定 [PbI6]4−框架,减少 Pb-I-Pb 键角剧烈摆动,并强化FA+与无机骨架之间的氢键耦合,因此相变势垒额外抬高 0.110 eV

  • 有效掺杂均匀分布同时做到位DPPBCs 不是简单的铯源,而是把掺杂、成核调控和缺陷钝化整合在同一个有机铯盐分子里,实现从表面到底部更一致的位阳离子分布。

  • 显著提升器件本征电学品质PVK-DPPBCs 器件获得26.91% 冠军效率、26.61% 认证效率和约26.51% 稳态效率;EL EQE 提高到14.32%,非辐射电压损失降低到50 mV

  • 在苛刻工况下保持长期稳定48 h 光浸泡后control 出现相转变、PVK-CsI 出现相分离,而PVK-DPPBCs 基本无明显变化;Cs迁移势垒也由 0.694 eV 提升到1.330 eV

四、数据总结

  • 器件效率数据

 PVK-DPPBCs 器件反扫/正扫 PCE 分别达到26.91% 26.36%,明显高于对照组的24.86% / 24.16% 和 PVK-CsI 组的25.56% / 24.98%

最优器件的VOC 1.180 VJSC 26.48 mA cm-2FF 86.11%;认证效率为26.61%,稳态输出效率约26.51%

放大到 1.00 cm后,器件仍取得 25.23% 的冠军效率,说明这一分子策略具备向大面积制备迁移的潜力。

  • 稳定性数据

采用PTAA 作为更耐热的空穴传输层后,封装器件在85 °C1-sun、最大功率点跟踪1,500 h 后仍保持95% 初始效率,而对照组和PVK-CsI 组分别仅保持约66% 和 81%

总结:这篇文献不仅把两步法 FA-Cs 钙钛矿器件效率推升到26.91%(认证 26.61%),更通过DPPBCs 建立了受控掺杂均匀分布缺陷钝化稳相增强的一体化路径,为高效率、可制造、长寿命的FA-Cs 钙钛矿太阳能电池提供了新的分子设计范式。

DOI: 10.1038/s41560-026-02016-7

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  1. CONNECT:[ UseTime:0.000494s ] mysql:host=127.0.0.1;port=3306;dbname=aa460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000798s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002034s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000237s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000542s ]
  6. SELECT * FROM `set` [ RunTime:0.000217s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000523s ]
  8. SELECT * FROM `article` WHERE `id` = 500394 LIMIT 1 [ RunTime:0.000362s ]
  9. UPDATE `article` SET `lasttime` = 1776630730 WHERE `id` = 500394 [ RunTime:0.015119s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000231s ]
  11. SELECT * FROM `article` WHERE `id` < 500394 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005053s ]
  12. SELECT * FROM `article` WHERE `id` > 500394 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000431s ]
  13. SELECT * FROM `article` WHERE `id` < 500394 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001574s ]
  14. SELECT * FROM `article` WHERE `id` < 500394 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000799s ]
  15. SELECT * FROM `article` WHERE `id` < 500394 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000677s ]
0.098381s