Dual Surface Modifications of NiOx/Perovskite Interface for Enhancement of Device Stability

• DOI: 10.1021/acsami.3c02156
• Publication Date: 2023-05-08T04:46:21Z
• Authors: Jingyang Lin; Yantao Wang; Abdul Khaleed; Ali Asgher Syed; Yanling He; Christopher C. S....; Yin Li; Kuan Liu; Gang Li; Kam Sing Wong; Jasminka Popović; Jing Fan; Alan Man Ching Ng; Aleksandra B. Dju...
• Keywords: Passivation; Surface Modification; Non-blocking I/O

Various phosphonic acid based self-assembled monolayers (SAMs) have been commonly used for interface modifications in inverted perovskite solar cells. This typically results significant enhancement of the hole extraction and consequent increase power conversion efficiency. However, surface coverage packing density SAM molecules can vary, depending on chosen material underlying oxide layer. In addition, different diverse effects interfacial energy level alignment film growth, resulting complex relationships between modification, efficiency, lifetime. Here we show that ethanolamine modification combined with [2-(9H-carbazol-9-yl)ethyl]phosphonic (2PACz) improvement device stability compared to devices 2PACz only. The significantly smaller size enables it fill any gaps provide improved defect passivation, while its chemical structure complementary passivation. Consequently, films are more stable under illumination (slower photoinduced segregation), exhibit enhancement. Despite similar efficiencies (PCE) only ethanolamine-2PACz (PCE champion ∼21.6-22.0% rigid ∼20.2-21.0% flexible devices), T80 lifetime simulated ambient is than 15 times both devices.