Doped hole transport layer for efficiency enhancement in planar heterojunction organolead trihalide perovskite solar cells

Wang, Qi; Bi, Cheng; Huang, Jinsong

doi:10.1016/j.nanoen.2015.04.029

Cited by 284 publications

(217 citation statements)

References 29 publications

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“…Note that for small-area active area (0.12 cm 2 ), which is close to a cell area often reported in literature, a PCE of 18.3% has been achieved (reverse scan), with a stabilized power output at PCE of 17.5% ( Figure S10, Supporting Information). This stabilized effi ciency output is amongst the best reported in the literature [ 23,28,53 ] for planar PSCs.…”

Section: Communicationsupporting

confidence: 61%

Square‐Centimeter Solution‐Processed Planar CH₃NH₃PbI₃ Perovskite Solar Cells with Efficiency Exceeding 15%

et al. 2015

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The preparation of uniform, high-crystallinity planar perovskite films with high-aspect-ratio grains over a square-inch area is demonstrated. The best power conversion efficiency (PCE) of 16.3% (stabilized output of ≈15.6%) is obtained for a planar perovskite solar cell (PSC) with 1.2 cm2 active area, and the PCE jumps to 18.3% (stabilized output of ≈17.5%) for a PSC with a 0.12 cm2 active area.

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Section: Communicationsupporting

confidence: 61%

Square‐Centimeter Solution‐Processed Planar CH₃NH₃PbI₃ Perovskite Solar Cells with Efficiency Exceeding 15%

et al. 2015

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“…5(a), the PL intensity of the film formed from PbI 2 (DMSO) is approximately 30 times greater than that from PbI 2 film, indicating the loss due to the non-radiative recombination is about 30 times larger in PbI 2 system than in PbI 2 (DMSO). This excessive non-radiative recombination between the two systems can lead to an open-circuit voltage difference ΔV, and the voltage difference ΔV can be quantified via the PL intensity [54][55][56] [57,58]. We also optimized the PVSCs fabricated from PbI 2 (DMSO) with PTAA as HTL in this work.…”

Section: Resultsmentioning

confidence: 99%

Controlled crystallization of CH3NH3PbI3 films for perovskite solar cells by various PbI2(X) complexes

Yan

Zhang

et al. 2016

Solar Energy Materials and Solar Cells

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a b s t r a c tLead halide complexes are efficient precursors to obtain high quality perovskite films and high performance solar cells. However, how the lead halide complex affects the crystallization kinetics and thus the film quality of perovskite has not been systematically studied. Herein, two PbI 2 (X) complexes with different coordination strength of ligand X in complexation with PbI 2 (PbI 2 (DMF) and PbI 2 (DMSO)) are synthesized. The correlation between the morphology, evolution of the perovskite formation, defects state, carrier lifetime and the subsequent photovoltaic performance are investigated in details via a twostep coating method with various PbI 2 (X) complexes. We find that PbI 2 (DMSO) derived perovskite film shows larger grains and vertically oriented grain boundaries as well as enhanced photoluminescence intensity and longer carrier lifetime. As a result, highly efficient inverted planar perovskite solar cells with a power conversion efficiency up to 17.0% are achieved from PbI 2 (DMSO) complex under 1 sun illumination. This research could open up a new pathway to further improve the performance of perovskite solar cells through the control of perovskite crystallization kinetics by choosing proper PbI 2 (X) complex precursors.

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“…We then deposit the hole-transporter material (HTM) of ∼20 nm thickness by spin-coating a solution of F4-TCNQ-doped poly-TPD (1-Material Inc.) following the work of Wang et.al. 35 Then the perovskite layer was prepared by spin-coating at 2000 rpm for 45s from as-prepared precursor solution, drying the substrates for 10 min on the bench in the glovebox, followed by annealing at 100 o C for 5 min. For the n-type 29 collection layers, PCBM (dissolved in DCB, 2 wt%) was spin-coated on top of the perovskite films at 1000 rpm for 30s.…”

Section: Device Fabricationmentioning

confidence: 99%

Efficient perovskite solar cells by metal ion doping

Wang

Pathak

et al. 2016

Energy Environ. Sci.

396

323

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BROADER CONTEXTPerovskite solar cells, which promise to deliver the highest efficiency, lowest cost nextgeneration PV technology, have been largely advanced over the last few years by improvements in the polycrystalline thin film quality. So far, improvements in film uniformity and smoothness, have mainly been at the expense of crystalline grain-size, and charge recombination losses at defect sites. High luminescence efficiency, which is an indication of better optoelectronic quality, has generally been found in films with polycrystalline grains of many micrometres in scale. This suggests a current compromise between ideal morphology and ideal optoelectronic quality.For traditional semiconductors and crystalline solids, the influence of impurity ion doping has been studied extensively and can either alter the crystallisation or induced electronic positive or negative type doping. However, in the perovskite community, impurity doping has been largely unexplored. Here, we show that doping the perovskite solution with Al 3+ , which has a much smaller ionic radius than Pb 2+ , has profoundly positive influenced on the crystalline and optoelectronic quality of the perovskite absorber layer: We demonstrate a two-fold increase in the photoluminescence quantum efficiency and a significantly reduced electronic disorder, despite the films still having polycrystalline grains on the order of one micrometer is scale. This largely overcomes the trade-off between film smoothness and optoelectronic quality, and these improvements translate into highly efficient planar heterojunction perovskite solar cells.Our work paves the way for further improvement of the optoelectronic quality of perovskite thin films, and subsequent devices, via highlighting a new avenue for investigation of the role of dopant impurities upon crystallisation and controlling the electronic defect density in the perovskite thin films. ABSTRACTRealizing the theoretical limiting power conversion efficiency (PCE) in perovskite solar cells requires a better understanding and control over the fundamental loss processes occurring in the bulk of the perovskite layer and at the internal semiconductor interfaces in devices. One of the main challenges is to eliminate the presence of charge recombination centres throughout the film which have been observed to be most densely located at regions near the grain boundaries.Here, we introduce aluminium acetylacetonate to the perovskite precursor solution, which improves the crystal quality by reducing the microstrain in the polycrystalline film. At the same time, we achieve a reduction in the non-radiative recombination rate, a remarkable improvement in the photoluminescence quantum efficiency (PLQE) and a reduction in the electronic disorder deduced from an Urbach energy of only 12.6 meV in complete devices. As a result, we demonstrate a power-conversion efficiency (PCE) of 19.1% with negligible hysteresis in planar heterojunction solar cells comprising all organic p and n-type charge collection layers. Our work shows that...

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Doped hole transport layer for efficiency enhancement in planar heterojunction organolead trihalide perovskite solar cells

Cited by 284 publications

References 29 publications

Square‐Centimeter Solution‐Processed Planar CH₃NH₃PbI₃ Perovskite Solar Cells with Efficiency Exceeding 15%

Square‐Centimeter Solution‐Processed Planar CH₃NH₃PbI₃ Perovskite Solar Cells with Efficiency Exceeding 15%

Controlled crystallization of CH3NH3PbI3 films for perovskite solar cells by various PbI2(X) complexes

Efficient perovskite solar cells by metal ion doping

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Doped hole transport layer for efficiency enhancement in planar heterojunction organolead trihalide perovskite solar cells

Cited by 284 publications

References 29 publications

Square‐Centimeter Solution‐Processed Planar CH3NH3PbI3 Perovskite Solar Cells with Efficiency Exceeding 15%

Square‐Centimeter Solution‐Processed Planar CH3NH3PbI3 Perovskite Solar Cells with Efficiency Exceeding 15%

Controlled crystallization of CH3NH3PbI3 films for perovskite solar cells by various PbI2(X) complexes

Efficient perovskite solar cells by metal ion doping

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Square‐Centimeter Solution‐Processed Planar CH₃NH₃PbI₃ Perovskite Solar Cells with Efficiency Exceeding 15%

Square‐Centimeter Solution‐Processed Planar CH₃NH₃PbI₃ Perovskite Solar Cells with Efficiency Exceeding 15%