Manipulating the film morphology evolution toward green solvent‐processed perovskite solar cells

Abstract

High‐performance perovskite solar cells (PVSCs) with low energy consumption and green processing are highly desired, but constrained by the difficulty in morphology control and the poor understanding on morphology evolution mechanisms. To address this issue, here we studied the effect of antisolvents on the perovskite film formation. We found that both the antisolvents and the perovskite composition affect the perovskite film morphology greatly via influencing the intermediate phase, and different perovskite compositions require different antisolvents to reach the optimal morphology. This provides the opportunity to achieve high‐performance PVSCs with green antisolvent, that is, isopropanol (iPA) by changing the perovskite compositions, and leads to a power conversion efficiency (PCE) of 21.50% for PVSCs based on MA0.6FA0.4PbI3. Further, we fabricated “fully green” PVSCs with all layers prepared by green solvents, and the optimal PCE can reach 19%, which represents the highest among PVSCs with full‐green processing. This work provides insight into the perovskite morphology evolution and paves the way toward “green” processing PVSCs.

Ligand exchange engineering of FAPbI3 perovskite quantum dots for solar cells

“…Due to the combined advantages of perovskites and quantum dots (QDs), such as low cost, solution processability, tunable bandgap energy (E g ) and high stability [1][2][3][4][5][6][7][8][9], perovskite QDs (PQDs) have received increasing attention for application in light-emitting diodes [10,11], photodetector [12][13][14], and solar cells [15,16]. Since the first PQD solar cells (PQDSCs) were successfully fabricated by Swarnkar et al in 2016 [17], with the material synthesis improvement [18][19][20], post-treatment of PQDs [21][22][23][24][25], and tuning device structure of solar cells [26][27][28][29], the performance of inorganic CsPbI 3 PQDSCs has considerably improved.…”

Arrays of spherical nanostructured oxide particles for photon management enhancement in photovoltaic devices

“…Also, it is worth pointing out that the crystallization of the film is limited with the incorporation of SNOPs into the TiO 2 layer, i.e., increasing the surface roughness of the films and affecting the collection of carriers, thus being unable to maximize its optical performance enhancement. 57,58 Moreover, we further verify the universal capability of SNOPs for photon management. Also, it is urgent that the best combination of optical gain is explored and the maximum gain of the optical performance with minimal experimental costs is achieved.…”

“…, increasing the surface roughness of the films and affecting the collection of carriers, thus being unable to maximize its optical performance enhancement. 57,58…”

A Novel Multiple‐Ring Aromatic Spacer Based 2D Ruddlesden–Popper CsPbI3Solar Cell with Record Efficiency Beyond 16%

“…Benefiting from the advantages of the 1-NA spacer, we fabricated 2D (n = 4) RP 1-NA-Pb and PEA-Pb perovskite films by one-step spin coating using methylammonium chloride (MACl) in isopropanol (IPA) solution as an anti-solvent to induce crystal growth. [36][37][38][39] To explore whether NH⋯I hydrogen bonding interactions exist between the PEA + /1-NA + cations and the inorganic layer, a series of characterizations were performed. Figure 2a displays the Fourier transform infrared (FTIR) spectra of PEA-Pb and 1-NA-Pb powder scraped from glass substrate.…”