Zhang Yuanyuan, Chen Qiao, Yang Hyun-Seock, Kim Danbi, Shin Insoo, Lee Bo Ram, Kim Joo Hyun, Moon Doo Kyung, Kim Kwang Ho, Park Sung Heum
Department of Physics, Pukyong National University, Busan 48513, Republic of Korea.
Hybrid Interface Materials Global Frontier Research Group, Pusan National University, Busan 608-737, Republic of Korea.
ACS Appl Mater Interfaces. 2021 Jul 21;13(28):33172-33181. doi: 10.1021/acsami.1c09093. Epub 2021 Jul 8.
Despite tremendous progress in the power conversion efficiency (PCE) of perovskite solar cells (PeSCs), the long-term stability issue remains a significant challenge for commercialization. In this study, by blending organic halide salts, phenylethylammonium halide (PEAX, X = I, Br), with CHNHPbI (MAPbI), we achieved remarkable enhancements in the water-repellency of perovskite films and long-term stability of PeSCs, together with enhanced PCE. The hydrophobic aromatic PEA group in PEAX protects the perovskite film from destruction by water. In addition, the smaller halide Br in PEABr restructures MAPbI to form MAPbIBr during post-annealing, leading to lattice contraction with beneficial crystallization quality. The perovskite films modified by PEAX exhibited excellent water resistance. When the perovskite films were directly immersed in water, no obvious decompositions were observed, even after 60 s. The PEAX-decorated PeSCs exhibited considerable long-term stability. Under high-humidity conditions (60 ± 5%), the PEAX-decorated PeSCs held 80.5% for PEAI and 85.2% for PEABr of their original PCE after exposure for 100 h, whereas the pristine PeSC device lost more than 99% of its initial PCE after exposure for 60 h under the same conditions. Moreover, compared to the pristine device with a PCE of 13.28%, the PEAX-decorated PeSCs exhibited enhanced PCEs of 17.33% for the PEAI device and 17.18% for the PEABr device.
尽管钙钛矿太阳能电池（PeSCs）的功率转换效率（PCE）取得了巨大进展，但长期稳定性问题仍然是商业化的重大挑战。在本研究中，通过将有机卤化物盐苯乙铵卤化物（PEAX，X = I，Br）与CHNHPbI（MAPbI）混合，我们实现了钙钛矿薄膜疏水性和PeSCs长期稳定性的显著提高，同时提高了PCE。PEAX中疏水性的芳香族PEA基团保护钙钛矿薄膜免受水的破坏。此外，PEABr中较小的卤化物Br在退火后会重构MAPbI以形成MAPbIBr，导致晶格收缩，结晶质量良好。经PEAX修饰的钙钛矿薄膜表现出优异的耐水性。当钙钛矿薄膜直接浸入水中时，即使在60秒后也未观察到明显分解。经PEAX修饰的PeSCs表现出相当可观的长期稳定性。在高湿度条件（60±5%）下，经PEAI修饰的PeSCs在暴露100小时后保持其原始PCE的80.5%，经PEABr修饰的保持85.2%，而在相同条件下，原始PeSC器件在暴露60小时后失去了超过99%的初始PCE。此外，与PCE为13.28%的原始器件相比，经PEAX修饰的PeSCs的PCE有所提高，经PEAI修饰的器件为17.33%，经PEABr修饰的器件为17.18%。
