Defect‐Engineering‐Enabled High‐Efficiency All‐Inorganic Perovskite Solar Cells

Abstract

The emergence of cesium lead iodide (CsPbI3) perovskite solar cells (PSCs) has generated enormous interest in the photovoltaic research community. However, in general they exhibit low power conversion efficiencies (PCEs) because of the existence of defects. A new all‐inorganic perovskite material, CsPbI3:Br:InI3, is prepared by defect engineering of CsPbI3. This new perovskite retains the same bandgap as CsPbI3, while the intrinsic defect concentration is largely suppressed. Moreover, it can be prepared in an extremely high humidity atmosphere and thus a glovebox is not required. By completely eliminating the labile and expensive components in traditional PSCs, the all‐inorganic PSCs based on CsPbI3:Br:InI3 and carbon electrode exhibit PCE and open‐circuit voltage as high as 12.04% and 1.20 V, respectively. More importantly, they demonstrate excellent stability in air for more than two months, while those based on CsPbI3 can survive only a few days in air. The progress reported represents a major leap for all‐inorganic PSCs and paves the way for their further exploration in order to achieve higher performance.

Halide Perovskites: Thermal Transport and Prospects for Thermoelectricity

“…[ 63,64 ] On the other hand, an all‐inorganic halide perovskite has its organic cations replaced by inorganic cations, with Cs + in most cases. [ 65 ] Interestingly, the 3D CsPbBr 3 also has a 2D (CsPb 2 Br 5 ) and a 0D (Cs 4 PbBr 6 ) counterpart. [ 66 ] Similarly, a dimensionality change in an inorganic halide perovskite can bring about unexpected ramifications to its electronic and thermal properties.…”

Unfolding the Influence of Metal Doping on Properties of CsPbI3 Perovskite

“…[1][2][3][4] In particular, excess HI stabilizes the black phase at room temperature, but a metastable phase persists in the perovskite, which transforms black to yellow phase upon annealing at high temperatures. [3,[5][6][7] Various results reveal the existence of polymorph nature in CsPbI 3 which remains less stable than the yellow non-perovskite polymorph. [8,9] Also, doping of metal cations besides excessive HI was reported to stabilize the α-phase of CsPbI 3, [10] and these materials based perovskite solar cells (PSCs) achieved attractive efficiencies.…”

“…[8,9] Also, doping of metal cations besides excessive HI was reported to stabilize the α-phase of CsPbI 3, [10] and these materials based perovskite solar cells (PSCs) achieved attractive efficiencies. [6,11] Earlier, Eu 3+ doping in CsPbI 2 Br suppressed the non-radiative charge recombination, and a high open-circuit voltage (V oc ) of 1.27 V was achieved, with a high power conversion efficiency (PCE) of 13.71%. [12] Also, Hu et al reported that the incorporation of 4 mol% Bi 3+ stabilizes the α-phase of CsPbI 3 , achieving a high PCE of 13.21%.…”

Interfacial Modification through a Multifunctional Molecule for Inorganic Perovskite Solar Cells with over 18% Efficiency

“…The carboxylic acid and amine groups on ATPA engender strong interactions with TiO 2 and perovskite to facilitate efficient electron transfer from perovskite to planar TiO 2 ETL. Moreover, the iodide groups in ATPA could provide a I‐rich growth condition, which is benefiting for the formation CsPbI 3 perovskites with suppressed intrinsic defects . As a result, the V OC and FF of CsPbI 3 PVSCs could be simultaneously improved, leading to a high PCE over 18.12% with a V OC of 1.11 V and a FF of 81.86%.…”