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Updated: May 24, 2026
Fabrication of Fully Solution Processed Inorganic Nanocrystal Photovoltaic Devices
Published on: July 8, 2016
Molecular interfaces drive vertical crystallization in Dion-Jacobson perovskite solar cells
Rui Wang1, Xiyue Dong1, Yuting Ma1
1State Key Laboratory of Elemento-Organic Chemistry, the Centre of Nanoscale Science Technology and Key Laboratory of Functional Polymer Materials, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin 300071, China.
None:
Two-dimensional perovskites are promising candidates for photovoltaics due to their intrinsic structural stability, but their efficiency is often limited by poor charge transport, in part due to unfavorable crystal orientation. Here, we report a molecular interface engineering strategy using dual-anchoring organic acids, croconic acid (CA) and squaric acid (SA), to direct vertical crystallization in Dion-Jacobson (DJ) perovskite films. These molecules form robust interlayers between the NiOx hole transport layer and TTDMA (thieno[3,2-b]thiophene-2,5-diyldimethanaminium)-based DJ perovskites (nominal n = 4), with SA exhibiting ordered vertical orientation via bidentate coordination. This templated interface promotes vertical orientation, reduces interfacial defects and lattice strain, and suppresses Ni3+-induced oxidation of I-. As a result, devices incorporating SA achieve a champion power conversion efficiency of 22.03% (certified 21.42%) along with outstanding operational stability. This study demonstrates a general molecular interface strategy to direct vertical crystallization and improve the performance of layered perovskite solar cells.
