Research Details

 

Metal halide perovskite solar cells (PSCs) have attracted significant research attention in the past years and are regarded as a promising candidate for next-generation photovoltaic technology. This unprecedented surge in device performance is a testament to the extent to which PSCs upended the scientific knowledge of solution-processed photovoltaic devices. This remarkable success can largely be ascribed to a steadily improved device design, combined with optimization of the employed materials: from the first mesostructured configuration – a legacy of the evolution of PSCs from the work on dye-sensitized solar cells – to the planar thin-film design; and from the early methyl-ammonium lead iodide perovskite to the quadruple-cation mixed-halide perovskite.

PSCs can be fabricated either in the n‐i‐p or p‐i‐n device configuration; the first letter refers to which contact was deposited first, as sketched in Figure 1. Beyond nomenclature, the device configuration influences several physical properties. Therefore, at KPV-LAB we develop novel charge selective contacts and passivation techniques aiming high performance.

Figure 1. Schematic representation of n‐i‐p and p‐i‐n PSCs with a detailed view of the perovskite/ETL interface. (Source: Aydin, E., De Bastiani, M., De Wolf, S., Defect and Contact Passivation for Perovskite Solar Cells. Adv. Mater. 2019, 31, 1900428.)

Currently, KPV-LAB has focused on developing large-area compatible fabrication methods for high-performance solar cells using emerging hybrid perovskite material systems which include mixed cations and mixed halides. We majorly work on precursor-process-structure-property-performance relationship for hybrid lead halide perovskites, then translate these lessons into scalable processes, with the aim of achieving PCE > 25% and extended stability.

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An analytical solution of photoluminescence reabsorption (PLr) is used to determine the intrinsic radiative carrier recombination rate of metal-halide perovskite films. Simulation of its impact on the quasi-Fermi-level splitting (QFSL) reveals it is detrimental at high but advantageous at low nonradiative recombination rates. Importantly, neglecting PLr results in overestimation of the effective nonradiative recombination rate in perovskite solar cells.

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Tin Oxide Electron‐Selective Layers for Efficient, Stable, and Scalable Perovskite Solar Cells

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The MAPbI3 polycrystalline films with 25.15um charge carrier diffusion length and grain size of 11 um are achieved by slot-die method assisted by KSCN. Based on the films, the planar solar cells with all layers being deposited by scalable methods achieve an efficiency of 21.38%.

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This study, which came out in the recent issue of ACS Applied Materials & Interfaces, successfully demonstrates the Lewis-acid (TPFB) doping of the widely used spiro-OMeTAD hole transport materials for perovskite solar cells to. This dopant replaces the conventional LiTFSI/tBP doping. By doing so, the device stability is increased and processing is simplified.

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Impact of Cesium/Rubidium Incorporation on the Photophysics of Multiple‐Cation Lead Halide Perovskites

This work, published in Solar RRL,  presents a detailed study of the photophysics of multiple‐cation mixed halide lead perovskites and develops a concise picture of the impact of cesium/rubidium incorporation on the photophysics and device performance.

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Dynamics of antisolvent processed hybrid metal halide perovskites studied by in situ photoluminescence and its influence on optoelectronic properties

In collaboration with Carolin M. Sutter-Fella from Lawrence Berkeley National Laboratory

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Ambient blade coating of mixed cation, mixed halide perovskites without dripping: in situ investigation and highly efficient solar cells
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A universal solution processed interfacial bilayer enabling ohmic contact in organic and hybrid optoelectronic devices
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Carrier Extraction from Perovskite to Polymeric Charge Transport Layers Probed by Ultrafast Transient Absorption Spectroscopy

 

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Multi-cation Synergy Suppresses Phase Segregation in Mixed-Halide Perovskites
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Defect and Contact Passivation for Perovskite Solar Cells

A comprehensive review on the passivation routes for perovskite solar cells toward the Shockley–Queisser limit.

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Temperature Dependence of the Urbach Energy in Lead Iodide Perovskites
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Interfacial Dynamics and Contact Passivation in Perovskite Solar Cells
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Room-Temperature Sputtered Nanocrystalline Nickel Oxide as Hole Transport Layer for p−i−n Perovskite Solar Cells

This study unveils the potential of the room-temperature processed sputtered-NiOx hole transport layers for the single junction perovskites and perovskite-based tandem solar cells, specifically which has rough bottom cells.

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A Universal Double-Side Passivation for High Open-Circuit Voltage in Perovskite Solar Cells: Role of Carbonyl Groups in Poly(methyl methacrylate)

Thanks to PMMA: PCBM Double-side passivation, very high‐efficiency (≈20.8%) perovskite cells with some of the highest open circuit voltages (1.22 V) reported for the same 1.6 eV bandgap are demonstrated.

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