近日，苏州大学李耀文团队报道了钙钛矿太阳能电池用电子共振增强分子。相关论文于2026年7月22日发表在《自然》杂志上。

自组装单分子层（SAMs）锚定在透明导电氧化物（TCO）衬底上，形成界面分子偶极子以从钙钛矿层提取载流子，已推动钙钛矿太阳能电池（pero-SCs）效率的逐步提升。然而，由于配位位点上电子密度受限导致的固有键合强度不足，会引发SAMs脱附，并在运行应力下损害电荷提取，对其长期稳定性构成显著挑战。

为解决这一问题，研究组设计了一种具有给体-受体-给体（D-A-D）共振分子结构的SAM，其中电子共振增加了受体锚定基团处的负电荷密度，显著增强了膦酸-氧化铟锡（ITO）锚定键，并防止了运行过程中SAM的脱附。应用D-A-D共振SAM的器件具有显著的操作稳定性：在85±5 °C下最大功率点追踪（MPPT）1,080小时后衰减可忽略不计；在85±5 °C下金属卤化物（MH）灯照明（100 mW cm^-2，内含4.4%紫外线）1,080小时后仍保持>93%；在−40 °C至85 °C之间经过720次重复热循环后仍保持>98%。

同时，共振诱导的电荷离域促进了高效的载流子传输，在0.063 cm²器件上实现了认证的27.69%的功率转换效率（PCE），在有效面积为15.64 cm²的器件上实现了23.63%。在柔性衬底（0.063 cm²）上也实现了26.64%的认证效率，证明了该方法在不同类型衬底上的普适性。

附：英文原文

Title: Electronic-resonance enhanced molecule for perovskite solar cells

Author: Wu, Xiaoxiao, Kou, Wenwen, Li, Zewei, Zhang, Tiankai, Xu, Guiying, Zhang, Busheng, Yang, Heyi, Li, Shengyu, Shen, Yunxiu, Xu, Tingting, Wu, Yeyong, Yin, Yue, Chen, Haiyang, Cheng, Qinrong, Chen, Xian-Kai, Li, Yaowen, Li, Yongfang

Issue&Volume: 2026-07-22

Abstract: Self-assembly monolayers (SAMs), which anchor to transparent conductive oxide (TCO) substrate and form an interfacial molecular dipole to extract carriers from perovskite layer, has promoted a stepwise improvement in efficiency of perovskite solar cells (pero-SCs).1-5 However, the limited intrinsic bonding strength due to constrained electron density on coordination sites incurs SAMs desorption and compromises charge extraction under operational stressors, posing a notable challenge to their long-term stability.6,7 To address this, we design a SAM with donor-acceptor-donor (D-A-D) resonant molecular structure, in which the electronic resonance increases the negative charge density at the acceptor anchoring group, significantly strengthening the phosphonic acid-indium tin oxide (ITO) anchoring bond and preventing the SAM desorption during operation. The device applying D-A-D resonant SAM possesses remarkable operational stability with negligible decay under maximum-power-point tracking (MPPT) at 85±5 °C for 1,080h, maintains >93% after 1,080 h under metal halide (MH) lamp illumination (100 mW cm2, 4.4% UV inside) at 85±5 °C and also retains >98% after 720 repetitive thermal cycles between 40 °C and 85 °C. Concurrently, the resonance induced charge delocalization facilitates efficient carrier transport, realizing a certified power conversion efficiencies (PCEs) of 27.69% on 0.063 cm2 devices and 23.63% with aperture area of 15.64 cm2. The certified efficiency of 26.64% is also realized on flexible substrates (0.063 cm2), demonstrating the universality of this approach across different types of substrates.

DOI: 10.1038/s41586-026-10919-4

Source: https://www.nature.com/articles/s41586-026-10919-4