Additive engineering for high-performance room-temperature-processed perovskite absorbers with micron-size grains and microsecond-range carrier lifetimes

Abstract

CH3NH3PbI3 films with micrometer grains and microsecond carrier lifetimes are prepared through additive engineering.

Highly Efficient Guanidinium‐Based Quasi 2D Perovskite Solar Cells via a Two‐Step Post‐Treatment Process

“…During the period of thermal annealing, most of SCN − is evaporated as indicated by the X‐ray photoelectron spectroscopy (XPS) spectra shown in Figure S4 in the Supporting Information. This is consistent with the previous studies utilizing SCN − as additive …”

“…In this study, the improvement of the perovskite films can be attributed to the Ostwald ripening process during GASCN treatment, leading to the compact and uniform perovskite films after annealing recrystallization. On the other hand, the introduced SCN − favored the formation of crystal gains with large size via interaction between Pb 2+ and SCN − , resulting in aggregates in the precursor solution . During the period of thermal annealing, most of SCN − is evaporated as indicated by the X‐ray photoelectron spectroscopy (XPS) spectra shown in Figure S4 in the Supporting Information.…”

Ambient Air Condition for Room‐Temperature Deposition of MAPbI3 Films in Highly Efficient Solar Cells

“…For production of perovskite solar cells on industrial scale, it is of great importance that all the functional layers, especially the perovskite layer, of the solar cells could be prepared under ambient air condition and at room temperature . Although room‐temperature methods for deposition of perovskite films were reported before, the operation inside a glovebox significantly limits the fabrication processes to scale up, and also causes extra budget for atmosphere control during the fabrication of perovskite solar cells.…”

Retardation of Trap‐Assisted Recombination in Lead Halide Perovskite Solar Cells by a Dimethylbiguanide Anchor Layer

“…The amounto f extracted photo-carriers and eventual PCEs tend to be hampered by losses through Shockley-Read-Hall (SRH) recombina-tion. In this regard, there have been many strategies to control the trap level in perovskite thin films through optimizing the grain size, grain boundaries,a nd relateds tructural properties by additive engineering, [7][8][9][10][11][12][13] surface treatments, [14][15][16][17][18][19][20] film casting procedures, [21] etc. To fully reach the potentials of well-engineering perovskite crystallization with reduced bulk traps, there is an urgent need to attain efficient surfacep assivation for perovskite films with which chargee xcitation in the solar cells is promoted with mitigated interfacial charget rapping and resultant SRH recombination.…”