Wide-bandgap perovskites for multijunction solar cells: improvement of crystalline quality of Cs_0.1FA_0.9PbI_1.4Br_1.6 by using lead thiocyanate

Abstract

Top cells based on mixed iodide-bromide lead perovskite (Cs0.1FA0.9PbI1.4Br1.6) for multijunction solar cells (MJ SCs) were fabricated and characterized. Various lead thiocyanate (Pb(SCN)2) concentrations (0%, 1%, 2%, 3%, and 4%)...

Understanding of Defect Passivation Effect on Wide Band Gap p-i-n Perovskite Solar Cell

“…The incorporation of Pb(SCN) 2 proves beneficial in promoting grain growth of perovskite film. 32,33 As shown in the results of FESEM images, the grain size is significantly enhanced from ∼0.112 to ∼1.061 μm, as the Pb(SCN) 2 concentration increases from 0 to 3 mol % (P0−P3). However, the more Pb(SCN) 2 induces formation of the undesirable PbI 2 phase at grain boundaries (GBs) as shown in Figure S1e,f, which is detrimental to the device stability.…”

“…The surface and cross-sectional field emission scanning electron microscopy (FESEM) images of perovskite films are shown in Figures and S1. The incorporation of Pb­(SCN) 2 proves beneficial in promoting grain growth of perovskite film. , As shown in the results of FESEM images, the grain size is significantly enhanced from ∼0.112 to ∼1.061 μm, as the Pb­(SCN) 2 concentration increases from 0 to 3 mol % (P0–P3). However, the more Pb­(SCN) 2 induces formation of the undesirable PbI 2 phase at grain boundaries (GBs) as shown in Figure S1e,f, which is detrimental to the device stability. , The TEACl passivation layer serves to mitigate excess PbI 2 on the perovskite surface.…”

“…These improvements may be attributed to enlargement of grains with incorporation of Pb­(SCN) 2 (the average sizes of 0.862 μm) (Figure ). In addition, P0 samples showed small grains and randomly oriented grain boundaries (GBs), which enhance the probability of charge recombination before the charge carriers are extracted to charge transport layers (HTL or ETL), while Pb­(SCN) 2 -incorporated perovskite films showed vertically aligned (Figure b–e, bottom) GBs minimizing charge recombination and facilitating better charge-carrier transport. , Under the optimized conditions of TEACl (P2T1) passivation layer, V OC and J SC were significantly improved by ∼56 mV and 1.7 mA cm –2 , respectively, contributing to an enhancement of the average PCE of 19.16 ± 0.35% (Figure b). The champion device achieved the PCE of 19.70% (19.70%) with a V OC of 1.174 V (1.171 V), a J SC,JV of 20.61 mA cm –2 (20.55 mA cm –2 ), and the FF of 81.39% (81.86%) under forward (reverse) scan.…”

Organic Semiconductor Based on N, S‐Containing Crown Ether Enabling Efficient and Stable Perovskite Solar Cells

“…[33,34] At the same time, the diffraction intensity of the main peak (001) in the perovskite film treated with CDT-S or CDT-N is significantly enhanced, indicating that the existence of CDT-S and CDT-N improved the crystallinity of perovskite film. [35] We also tested the UV-vis of perovskite films, as shown in Figure 3b, after the introduction of CDT-S or CDT-N in perovskite films, there was no significant change in the absorption spectra, manifesting that CDT-S or CDT-N did not influence the light absorption property of perovskite films.…”

A zero-dimensional hybrid copper(i) bromide single crystal with highly efficient green emission

“…In recent years, photoelectronic devices based on lead-based halide perovskites, such as photovoltaic cells, X-ray detectors, light-emitting diodes, and photodetectors, have demonstrated excellent performance and hold great commercial promise. [1][2][3][4][5][6][7][8] However, the toxicity of lead remains a significant threat to both humans and the environment. 9,10 The development of lead-free perovskites, achieved by substituting Pb 2+ with nontoxic or less toxic ions such as In 3+ , Sn 2+ , Sb 3+ , Bi 3+ , Mn 2+ , Zn 2+ , and Cu + , is a valid approach.…”