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2-Aminoethanethiol Hydroiodate Additives Induced Phase Stability Improvement of CsPbI3 Films for Use in Inorganic
Xihong Ding1,2,3, Demeng Qian1,3, Hui Wang1,3
1State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology (AUST), Huainan, 232001, Anhui, China.
Abstract:
This study investigates the role of 2-aminoethanethiol hydroiodate (2-AET·HI) additives in enhancing the phase stability and photovoltaic performance of CsPbI3 films for inorganic perovskite solar cells. The incorporation of 2-AET·HI into the precursor solution results in a more uniform and compact film morphology. X-ray diffraction (XRD) analysis reveals that the 2-AET·HI-treated CsPbI3 films retain their black α-phase, even after 300 h at 25% RH and ∼25 °C, whereas the control samples show a rapid transition to the nonphotoactive δ-phase. This improvement in phase stability is reflected in the enhanced photovoltaic performance, with the 2-AET·HI-modified devices exhibiting a power conversion efficiency (PCE) of 16.7%, compared to 15.4% for the control devices. Furthermore, the 2-AET·HI-modified devices display superior long-term stability, retaining 83% of their initial PCE after 192 h in ambient conditions, in stark contrast to the unmodified devices, which degrade rapidly.
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