Dual‐Interface‐Reinforced Flexible Perovskite Solar Cells for Enhanced Performance and Mechanical Reliability. Issue 47 (21st October 2022)

• Record Type: Journal Article
• Authors: Dai, Zhenghong; Li, Shunran; Liu, Xing; Chen, Min; Athanasiou, Christos E.; Sheldon, Brian W.; Gao, Huajian; Guo, Peijun; Padture, Nitin P.
• Is Part Of: Advanced materials. Volume 34:Issue 47(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-21
• Subjects: flexible solar cells -- interfaces -- mechanical reliability -- perovskites; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202205301
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Two key interfaces in flexible perovskite solar cells (f‐PSCs) are mechanically reinforced simultaneously: one between the electron‐transport layer (ETL) and the 3D metal‐halide perovskite (MHP) thin film using self‐assembled monolayer (SAM), and the other between the 3D‐MHP thin film and the hole‐transport layer (HTL) using an in situ grown low‐dimensional (LD) MHP capping layer. The interfacial mechanical properties are measured and modeled. This rational interface engineering results in the enhancement of not only the mechanical properties of both interfaces but also their optoelectronic properties holistically. As a result, the new class of dual‐interface‐reinforced f‐PSCs has an unprecedented combination of the following three important performance parameters: high power‐conversion efficiency (PCE) of 21.03% (with reduced hysteresis), improved operational stability of 1000 h T 90 (duration at 90% initial PCE retained), and enhanced mechanical reliability of 10 000 cycles n 88 (number of bending cycles at 88% initial PCE retained). The scientific underpinnings of these synergistic enhancements are elucidated. Abstract : Two key interfaces on either side of the metal‐halide perovskite thin film in flexible perovskite solar cells (f‐PSCs) are reinforced simultaneously. This new class of dual‐interface‐reinforced f‐PSCs has an unprecedented combination of high efficiency (21.03%), improved operational stability (1000 h T 90 ), and enhanced mechanical reliability (10 000 cycles n 88 ). The scientific underpinnings of these synergistic enhancements are elucidated.