Stabilizing perovskite-substrate interfaces for high-performance perovskite modules

Abstract

Avoiding buried voids The buried interfaces of perovskite solar cells are difficult to alter after synthesis. During manufacture, Chen et al . removed perovskite films with dimethyl sulfoxide solvent from the hole-transfer layer and observed a substantial void fraction that degraded film performance. Replacing most of the dimethyl sulfoxide with carbohydrazide, a lead-coordinating compound with a much higher boiling point, eliminated voids. Such solar cells maintained high power conversion efficiency after 550 hours of operation at 60°C. —PDS

23.7% Efficient inverted perovskite solar cells by dual interfacial modification

“…A similar effect has been previously observed in standard architecture devices, where the introduction of a self-assembled monolayer at the perovskite/ZnO interface led to a much-improved microstructure and an enhanced charge extraction ( 31 ). Recently, it has also been shown that reducing the voids formed at the buried interfaces of blade-coated perovskites also improves the photovoltaic performance of perovskite modules ( 32 ). Thus, our observation of a small increase in the extracted current density and the significantly enhanced FF of the PEAI cation HTL-modified photovoltaic devices is a result of the improved microstructure of perovskite layers formed on the PEAI cation–treated PTAA.…”

Highly Efficient and Stable CsPbTh3 (Th = I, Br, Cl) Perovskite Solar Cells by Combinational Passivation Strategy

“…[1][2][3][4][5][6][7] In recent years, the power conversion efficiency (PCE) of CsPbI 3 perovskite solar cells (PSCs) climbed rapidly from 2.9% first reported by Snaith and coworkers to 20.8% by Liu and co-workers, and the efficiency gap between the CsPbI 3 and organic-inorganic hybrid PSCs is further reduced. [8][9][10][11][12] Furthermore, CsPbI 3 has a suitable bandgap (≈1.70 eV) and can be used as the top cell of tandem photovoltaic cells. [13,14] Up to date, the introduction of small DMA = (CH 3 ) 2 NH 2 + organic cations into precursor solution is essential to approach efficient and stable CsPbI 3 PSCs.…”

Triple-cation perovskite solar cells fabricated by a hybrid PVD/blade coating process using green solvents

“…The interfacial void fraction was reduced by partially substituting DMSO with solid-state carbohydrazide to achieve 23.6% efficient p-i-n PSC and 19.2% efficient mini-module with an aperture area of 50 cm 2 by blade coating. 37 However, to dissolve the inorganic halide precursors, solvents like 2-methoxyethanol (2-ME) or alternatively, N,N-dimethylformamide (DMF) are usually used. 8,36 These solvents (2-ME, DMF) have been known for their reproductive toxicity (Category 1B, H360), bearing risk to workers and the environment.…”