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Inhibiting lattice distortion of CsPbI3 perovskite quantum dots for solar cells with efficiency over 16.6%
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2022-08-19 , DOI: 10.1039/d2ee02164a
Donglin Jia , Jingxuan Chen , Rongshan Zhuang , Yong Hua , Xiaoliang Zhang

Inorganic CsPbI3 perovskite quantum dots (PQDs) attracted tremendous attention for next-generation photovoltaics owing to their tunable surface chemistry and solution processability. However, the dynamically bound pristine ligands significantly suffer from dissociating from the PQD surface, and thus the intrinsic subtle lattices of PQDs are highly susceptible to distortion, dramatically affecting the long-range stacking and energy landscape of PQD solids. Herein, unfavorable [PbI6]4− octahedral tilts are effectively inhibited by riveting the aprotic trimethylsulfonium iodide (TMSI) ligand with an inverted triangular-pyramidal cationic structure into the vacancies of the PQD surface, which could leverage the steric effect to impart tensile strains from the PQD surface into the bulk. After riveting the TMSI ligands onto the PQD surface, the structural regularity, optoelectronic properties and stability of PQDs are substantially improved. Consequently, the PQD solar cell (PQDSC) yields an efficiency of up to 16.64%. The charge carrier dynamics within the PQDSCs are studied in-depth, which reveals that the remarkable performance of the PQDSCs is attributed to the oriented charge transport in the uniformly-packed PQD solid films with suppressed charge carrier recombination. This work provides new insight into the lattice-stabilization of PQDs through surface ligand engineering for high-performing optoelectronic devices.

中文翻译:

抑制太阳能电池用 CsPbI3 钙钛矿量子点的晶格畸变,效率超过 16.6%

无机 CsPbI 3钙钛矿量子点 (PQD) 因其可调节的表面化学和溶液加工性而引起了下一代光伏器件的极大关注。然而,动态结合的原始配体显着从 PQD 表面解离,因此 PQD 的内在细微晶格极易变形,极大地影响了 PQD 固体的长程堆积和能量景观。在此,不利的[PbI 6 ] 4−通过将具有倒三角锥阳离子结构的非质子碘化三甲基锍 (TMSI) 配体铆接到 PQD 表面的空位中,可以有效抑制八面体倾斜,这可以利用空间效应将拉伸应变从 PQD 表面传递到本体中。将TMSI配体铆接到PQD表面后,PQDs的结构规整性、光电性能和稳定性都得到了显着改善。因此,PQD 太阳能电池 (PQDSC) 的效率高达 16.64%。深入研究了 PQDSC 内的电荷载流子动力学,这表明 PQDSC 的显着性能归因于均匀堆积的 PQD 固体薄膜中的定向电荷传输,抑制了电荷载流子的复合。
更新日期:2022-08-19
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