Drop‐Casting to Make Efficient Perovskite Solar Cells under High Humidity

Abstract

Drop-casting was used to make MAPbI 3 films for solar cells. The crystal growth in drop-cast MAPbI 3 films was regulated by adjusting temperature. A mechanism for the formation of different morphology was proposed by combining in situ crystal-growth study with XRD measurements. The crystals in the films made at low temperature (60 8C) and high temperature (! 120 8C) are ( 110) and ( 200) oriented, respectively. The different crystal growth mode leads to quite different film morphology. Compared with spin-coating, drop-casting shows much better tolerance to humidity. MAPbI 3 solar cells made under 88 % humidity delivered a PCE of 18.17 %, which is the highest PCE for perovskite solar cells made under > 70 % humidity without antisolvent assistance.

Bifunctional Interfacial Regulation with 4‐(Trifluoromethyl) Benzoic Acid to Reduce the Photovoltage Deficit of MAPbI3‐Based Perovskite Solar Cells

“…The pristine PSCs demonstrate V OC and J SC values of 1.106 V and 20.55 mA cm À 2 , respectively, while the PSCs with BA-CF 3 SAMs have enhanced V OC and J SC values of 1.160 V and 21.55 mA cm À 2 , respectively. Notably, the V OC value of the PSCs with the BA-CF 3 SAMs is higher than values reported in other studies [42,43] based on MAPbI 3 . It should be noted that the voltage loss and the bandgap of the perovskite both influence the V OC of PSCs.…”

The disappearing additive: introducing volatile ethyl acetate into a perovskite precursor for fabricating high efficiency stable devices in open air

“…It reveals that the peaks at 14.08°, 28.49° and 31.91° correspond to the reflections from the (110), (220), and (310) planes of the orthorhombic space group ( I 4/ mcm ), respectively. 30,31 For EA-modified perovskite film, stronger diffraction peaks are observed. Fig.…”

Enhancement of perovskite solar cell performance by external down‐conversion of Eu‐complex film

“…As a result, we obtained a relatively low PCE compared with the world records, suggesting that we have to improve both the quality of the perovskite layer and the UV transmittance of Eu‐complex PDMS films by decreasing surface roughness and so on. For example, drop‐casting rather than spin‐coating will be a better method for preparing more efficient PSCs under high humidity, since drop‐casting without anti‐solvent assistance shows high tolerance to over 80% of humidity 16 …”

“…It also has the advantage of a wide application range due to its high flexibility. However, there are still some points to be supplemented and a lot of effort is required to solve them 15,16 …”