Concentrated perovskite photovoltaics enable minimization of energy loss below 0.5 eV under artificial light‐emitting diode illumination

Abstract

Summary Artificial light cells (ALCs) are potential energy suppliers for self‐powered internet‐of‐things. Recently, perovskite semiconductors have emerged as promising harvesters for recycling the energy from artificial lights; however, its corresponding ALCs have suffered from high energy loss (Eloss) over 0.6 eV caused by the insufficient trap passivation and the limited splitting of the quasi‐Fermi levels under dim light conditions. Here, we achieved highly efficient perovskite ALCs up to 42.1% power conversion efficiency by optimizing the photo‐active layer and concentrating light from artificial light‐emitting diodes (LEDs). In this work, we modified the perovskite ALCs by composition engineering, interfacial treatment, and thickness control, resulting in the reduced trap density and enhanced light collection. We found that perovskite ALCs under the ×32 concentrated 1000 lx LED afford an improved VOC of 1.10 V with a reduced Eloss of 0.48 eV compared to the devices under nonconcentrated light (VOC = 0.96 V and Eloss = 0.62 eV). More importantly, due to the absences of ultraviolet and infrared wavelengths in artificial LED light sources, the perovskite ALCs have higher stability under concentrated LED illumination than devices under outdoor sunlight.

Dual‐Phase Stabilized Perovskite Nanowires for Reduced Defects and Longer Carrier Lifetime

“…The ideality factors ( n ) of PSCs were calculated by measuring the light intensity‐dependent V OC (Figure 4e). [ 45,46 ] The calculated ideality factors for the control, single‐phase PNW, and dual‐phase PNW PSCs are 1.30, 1.26, and 1.08, respectively. The n value in the dual‐phase PNW PSC is closer to 1, indicating a minimized trap‐assisted recombination in the device.…”

Perovskite Photovoltaics for Artificial Light Harvesting

“…This passivation approach led to an impressively high efficiency of 40.1 % under LED light. Under a comprehensive engineering protocol for compositional tuning, interfacial treatment using PEABr, and active-layer-thickness optimization, our group [57] recently reported a highly efficient PALC, thus achieving a PCE of 42.1 % by concentrating artificial LED light. It was realized that optimized PALC under × 32 concentrated 1000 lux LED demonstrated an improved V OC of 1.10 V with a highly reduced energy loss of 0.48 eV relative to a V OC of 0.96 V and energy loss of 0.62 eV for devices under non-concentrated light.…”

Oligo(Ethylene Glycol) Functionalization of a Dopant-Free Hole Transport Material for Perovskite Photovoltaics

“…When the EIS parameters were extracted by fitting to the equivalent circuit, the PPV with PL0.25 HTM showed increased interfacial and bulk recombination lifetimes than the devices with P0, PSy2, or PMy1 HTMs (Table S4). This increased lifetime leads to the enhanced V OC and FF values of the PPV with PL0.25 HTM …”