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High-Intensity CsPbBr <sub/>3</sub> Perovskite LED using Poly(bis(4-phenyl)(2,4,6-trimethylphenyl)amine) as Hole Transport and Electron-Blocking Layer
摘要： The majority of highly efficient perovskite light-emitting diodes (PeLED) contain PEDOT:PSS (poly(3,4-ethylenedioxythiophene):polystyrenesulfonate) as hole transport layer (HTL). However, the hygroscopic and acidic nature of PEDOT:PSS may lead to deterioration of PeLED performance. Moreover, due to its inferior electron-blocking properties, an additional electron-blocking layer (EBL) is required to establish charge balance and consequently obtain superior emission characteristics in typically electron-rich PeLED structures. In this work, PTAA (poly(bis(4-phenyl)(2,4,6-trimethylphenyl)amine)) serving both as HTL and EBL is employed to substitute PEDOT:PSS in PeLED. The perovskite CsPbBr3 is chosen as emissive layer (EML) material due to its high color purity and photoluminescence (PL) quantum yield. Dense CsPbBr3 films are fabricated on PTAA-coated ITO substrates by employing a one-step spin-coating approach based on nonstoichiometric perovskite precursor solutions. To suppress non-radiative recombination, a small amount of methylammonium bromide (MABr) is incorporated in the CsPbBr3 lattice. The resulting films exhibit excellent coverage and PL intensity. PeLED containing pure CsPbBr3 films as EML show a green emission with a peak at 520 nm, maximum luminance of 11,000 cd/m2, an external quantum efficiency (EQE) of 3.3 % and a current efficiency (CE) of 10.3 cd/A. Further enhancement to 21,000 cd/m2, 7.5 % and 27.0 cd/A is demonstrated by PeLED with MABr-doped CsPbBr3 layers.
关键词： PTAA,perovskite light-emitting diodes,PEDOT:PSS,electron-blocking layer,CsPbBr3,hole transport layer
更新于2025-09-16 10:30:52
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Efficiency improvement of planar inverted perovskite solar cells by introducing F8BT into PTAA as mixed hole transport layer
摘要： Hole-transport layer (HTL) is a crucial component to influence the crystallization of the perovskite layer which has close photovoltaic efficiency and stability of perovskite relationship with the photovoltaic efficiency and stability of perovskite solar cells (PVSCs). In this work, planar inverted PVSCs employing polytriarylamine (PTAA) HTL mixed with a polymeric material of poly(9,9-dioctyfluorene-co-benzothiazole) (F8BT) are fabricated, and the effect of mixed polymer HTL on the device performance was investigated. After the variation of the F8BT ratio in the mixed HTL, the average power conversion efficiency (PCE) of 14.88 % with negligible hysteresis was achieved and the champion device exhibits a PCE of 15.41 % due to the increased charge carrier extraction and optimized crystallization properties of perovskite. Unsealed planar p-i-n PVSCs with mixed polymer HTL show a 28.8 % incensement in average PCE (14.88 % vs 11.55 %) and over 30 % enhancement in stability at ambient condition for two weeks with respect to control due to the improvement in the crystallinity of perovskite layer and conductivity of polymer layer. This work provides an effective strategy for the development of highly efficient planar PVSC fabricated on mixed polymer HTL.
关键词： Planar perovskite solar cell,F8BT,PTAA,Mixed polymer HTL,Efficiency improvement
更新于2025-09-12 10:27:22
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Coordinated Optical Matching of a Texture Interface Made from Demixing Blended Polymers for High Performance Inverted Perovskite Solar Cells
摘要： The continuing increase of the efficiency of perovskite solar cells has pushed the internal quantum efficiency approaching 100%, which means the light-to-carrier and then the following carrier transportation and extraction are no longer limiting factors in photoelectric conversion efficiency of perovskite solar cells. However, the optimal efficiency is still far lower than the Shockley–Queisser efficiency limit, especially for those inverted perovskite solar cells, indicating significant fraction of light do not transmit into the active perovskite layer to be absorbed there. Here a planar inverted perovskite solar cell (ITO/PTAA/perovskite/PC61BM/bathocuproine (BCP)/Ag) is chosen as an example and we show that the external quantum efficiency (EQE) of it can be significantly improved by simply texturing the Poly [bis (4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) layer. By washing the film prepared from mixed polymer solution of PTAA and Polystyrene (PS), a textured PTAA/perovskite interface is introduced on the light-input side of perovskite to inhibit internal optical reflection. The reduction of optical loss by this simple texture method increases the EQE and then the photocurrent of ITO/PTAA/perovskite/PC61BM/BCP/Ag device with the magnitude about 10%. At the same time, this textured PTAA benefits the band edge absorption in this planar solar cell. The large increase of the short-circuit current together with the increase of fill factor pushes the efficiency of this inverted perovskite solar cell from 18.3% up to an efficiency over 20.8%. By using anti-reflection coating on glass to let more light into the device, the efficiency is further improved to 21.6%, further demonstrating the importance of light management in perovskite solar cells.
关键词： perovskite solar cell,interface texture,PTAA,internal optical reflection,optical matching
更新于2025-09-11 14:15:04
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Control of aggregation and dissolution of small molecules hole transport layer through a doping strategy of highly efficient perovskite solar cell
摘要： Recently, small molecule hole transporting materials (HTLs) have attracted growing interest in perovskite solar cells due to their low-cost, excellent stability and better energy level alignment with perovskite. Nonetheless, an amorphous and coarse surface film is one of the main obstructions to the performance of these small molecule HTLs. Herein, N,N′-Di(1-naphthyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine (NPB) small molecule was doped with a polymer to overcome the formation of molecular aggregation in HTL. This polymer doping strategy resulted into a very smooth surface, which improved photo-physical and electrochemical properties at HTL/perovskite interface. Consequently, a maximum power conversion efficiency (PCE) of 17.80%, 32% higher than the control, i.e. NPB-based device (13.57%), has been achieved. This work reveals critical behaviour of molecular aggregations on the performance of perovskite solar cells, which impairs the development of an efficient device based on small molecule HTLs.
关键词： PTAA,aggregation,dissolution,NPB,polymer doping,small molecule
更新于2025-09-11 14:15:04