Green Anti-solvent Processed Efficient Flexible Perovskite Solar Cells

Abstract

Flexible perovskite solar cells (PSCs) possess compatible features with low-cost, high throughput production approaches, showing great potentials in wearable, portable, flyable, and deployable applications. However, flexible PSCs with superior efficiency are commonly fabricated with an anti-solvent assisted crystallization (ASAC) method, which uses highly toxic solvents as the processed solvents. In this work, we use environmentally benign anti-solvents for the fabrication of flexible PSCs. Benefiting from the low-temperature solution processability of a high quality SnO2 electron transport layer (ETL) with superior electron extraction and transfer features, flexible PSCs show an impressive PCE over 17% under reverse scan. This, to the best of our knowledge, is among the highest performances for flexible PSCs and is the first report for flexible PSCs fabricated by green anti-solvent processed techniques. These results provide new opportunities for environmental-friendly manufacturing of high performance flexible PSCs.

Defect passivation through electrostatic interaction for high performance flexible perovskite solar cells

“…Despite obvious reduction on the PCE of the device was found under bending, it is notable that the PCE of the PSC can be recovered to its initial value after a stress relaxation overnight. This PCE self-recovered phenomenon has been also observed in our previous work [40] . This result demonstrates a good durability of our flexible PSCs.…”

Multilayer Cascade Charge Transport Layer for High‐Performance Inverted Mesoscopic All‐Inorganic and Hybrid Wide‐Bandgap Perovskite Solar Cells

“…The F‐TPZ devices have larger R rec values than the pristine devices under different bias voltages (Figure S13, Supporting Information), suggesting that the recombination process has been effectively suppressed for the device with cascade CTLs, which was in good agreement with the results discussed earlier. [ 64 ] The detailed analysis of the J – V curve (Figure S14, Supporting Information) can further disclose the variations of the charge collection within the cells. The slope of the J – V characteristic curve for the pristine sample (Figure 4f) shows a severe S‐shape near V OC , indicating the presence of an energetic barrier for charge collection.…”

Current advancements on charge selective contact interfacial layers and electrodes in flexible hybrid perovskite photovoltaics

“…In this regard, rational design and development of efficient flexible energy (storage/conversion) devices are highly warranted [8][9][10]. In particular, stretchable and wearable perovskite solar cells (PSCs) are receiving widespread attention over rigid type substrates (such as indium tin oxide (ITO)/fluorine-doped tin oxide (FTO) owing to their combined merits of high efficiency, light-weight, lowtemperature processing, eco-friendly nature, flexibility, portability, compatibility towards practical applications (roll-to-roll printing and large-area mass-scale production) [11][12][13][14][15][16][17]. A flexible perovskite solar cell (F-PSCs) comprises of 4 key components including flexible substrate [typically poly(ethylene terephthalate) (PET)/poly(ethylene naphthalate) (PEN)], transparent bottom contact electrode, perovskite (light absorber layer) and charge transport (electron/hole) interface layers and top electrode.…”