Robust hole transport material with interface anchors enhances the efficiency and stability of inverted formamidinium–cesium perovskite solar cells with a certified efficiency of 22.3%

Abstract

Herein, we report the use of pyridine anchoring group functionalized poly(triarylamine) (p-PY) as a hole transport layer at buried interfaces between the ITO and formamidinium–cesium perovskite layer to enhance the efficiency and stability of inverted PSCs.

Composition‐Conditioning Agent for Doped Spiro‐OMeTAD to Realize Highly Efficient and Stable Perovskite Solar Cells

“…Therefore, the significantly improved device performance was mainly attributed to two factors: 1) the improved energy level alignment and effective passivation of defects suppressing the interfacial non‐radiative recombination, thus contributing to the simultaneous improvement of J sc and V oc ; 2) the improved conductivity and mobility of Spiro:OEG benefiting the improvement of J sc . [ 53 ]…”

Strain Release and Defect Passivation in Formamidinium-Dominated Perovskite via a Novel in-Plane Thermal Gradient Assisted Crystallization Strategy

“…It is widely known that the photovoltage of a solar cell is directly linked with the ability to extract its internal electroluminescence (EL). , Typically, the voltage loss of PSCs is categorized into the radiative recombination voltage loss (Δ V rad ) and nonradiative recombination voltage loss (Δ V non‑rad ). The Δ V non‑rad is a key factor in dictating the ultimate V OC of the device, which can be calculated by the following equation: normalΔ V non‐rad = k T q ln nobreak0em.25em⁡ 1 EQE EL , where k is the Boltzmann constraint, T is the temperature, q is the electronic charge, and EQE EL is the external luminescence quantum efficiency. As shown in Figure e, the EQE EL values of the target and control devices were 4.42% (the injection current density is 24.34 mA cm –2 ) and 0.71% (the injection current density is 23.59 mA cm –2 ), respectively.…”

“…41,42 Typically, the voltage loss of PSCs is categorized into the radiative recombination voltage loss (ΔV rad ) and nonradiative recombination voltage loss (ΔV non-rad ). The ΔV non-rad is a key factor in dictating the ultimate V OC of the device, which can be calculated by the following equation: 43 = V ln…”

Recent advances in dopant-free organic hole-transporting materials for efficient, stable and low-cost perovskite solar cells

“…Very recently, a champion PCE of 22.8% was achieved in inverted PSCs with a dopant-free polymeric HTM. 175 Chen and co-workers synthesized a novel polymeric HTM (denoted as p-PY) with a lower lab synthesis cost of $72 g −1 by introducing pyridine rings as anchoring groups into the structure of PTAA. Compared to PTAA, p-PY showed a matchable energy level, higher mobility and conductivity, and enhanced defect passivation ability due to the introduction of the pyridine group.…”