Simultaneous enhancement in stability and efficiency of low-temperature processed perovskite solar cells
MetadataShow full item record
Mixed ion based perovskite solar cells (PSCs) have recently emerged as a promising photoactive material owing to their augmented electronic and light harvesting properties combined with stability enhancing characteristics. However, to date most of the high performing perovskite devices employ a high temperature (∼500° C) sintering process for depositing a conventional titanium oxide (TiO2) based electron transport layer (ETL), which is a serious bottleneck towards roll-to-roll processing with flexible substrates, large scale manufacturability and also results in high energy consumption. The present work demonstrates simultaneous enhancement in efficiency and stability in the perovskite solar cell that is totally fabricated using low temperature methods with the synthesis process temperature not exceeding 150 °C at any stage. The perovskite devices, thus fabricated, exhibited high power conversion efficiency of ∼14.5% and device stability > 570 hours (normalized PCE to reach 80% of its original value), which is the first of this kind of accomplishment ever reported in entirely low temperature processed PSCs. It is noteworthy to mention that the presented devices utilize a ∼360 °C lower temperature than required for the conventional TiO2 based PSCs to achieve similar enhancements in terms of stability and efficiency simultaneously. The high performing PSCs reported in this work incorporate mixed organic perovskite (MA0.6FA0.4PbI3) as the light absorber and aluminium-doped zinc oxide (AZO) as the electron transport layer. Adding to the merits, the MA0.6FA0.4PbI3/AZO devices exhibited a substantially low photocurrent hysteresis phenomenon. In order to examine the underlying causes of the efficiency and stability enhancements in AZO based devices, a low temperature processed MA0.6FA0.4PbI3/ZnO device was also fabricated and comparatively studied. Investigations reveal that the improved dark carrier mobility and superior interfacial electronic properties at the perovskite/AZO interface are attributed to their enriched device performance. Slow perovskite decomposition rate/high device stability with AZO based perovskite devices was found to be associated with the more hydrophobic and acidic nature of the AZO surface and the related interfacial interactions with the adjacent perovskite layer.
Showing items related by title, author, creator and subject.
Adsorbed carbon nanomaterials for surface and interface-engineered stable rubidium multi-cation perovskite solar cellsMahmud, M.; Elumalai, Naveen Kumar; Upama, M.; Wang, D.; Zarei, L.; Gonçales, V.; Wright, M.; Xu, C.; Haque, F.; Uddin, A. (2018)The current work reports the simultaneous enhancement in efficiency and stability of low-temperature, solution-processed triple cation based MA0.57FA0.38Rb0.05PbI3 (MA: methyl ammonium, FA: formamidinium, Rb: rubidium) ...
Controlled nucleation assisted restricted volume solvent annealing for stable perovskite solar cellsMahmud, M.; Elumalai, Naveen Kumar; Upama, M.; Wang, D.; Haque, F.; Wright, M.; Xu, C.; Uddin, A. (2017)Here we report, a controlled primary nucleation aided restricted volume solvent annealing method [NR method, NR stands for nucleation assisted restricted volume solvent annealing (RVSA)] along with mixed organic cation ...
Uddin, A.; Mahmud, M.; Elumalai, Naveen Kumar; Wang, D.; Upama, M.; Wright, M.; Chan, K.; Haque, F.; Xu, C. (2017)Perovskite solar cell (PSCs) is considered as the game changer in emerging photovoltaics technology. The highest certified efficiency is 22% with high temperature processed (∼500 °C) TiO2 based electron transport layer ...