Hematite electron-transporting layers for environmentally stable planar perovskite solar cells with enhanced energy conversion and lower hysteresis

Hu, Wei; Liu, Tao; Yin, Xuewen; Liu, Hu; Zhao, Xinglei; Luo, Senping; Guo, Ying; Yao, Zhibo; Wang, Jinshu; Wang, Ning; Lin, Hong; Guo, Zhanhu

doi:10.1039/c6ta09174a

Cited by 99 publications

(59 citation statements)

References 48 publications

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“…DSCs are made by a layer of dye-anchored mesoporous metal oxides, known as photoelectrodes, and covered with conducting glass plates on both sides [118]. Like TEG devices, efficiency is also important for solar cells.…”

Section: Solar Cellsmentioning

confidence: 99%

Metal oxides for thermoelectric power generation and beyond

Feng

Jiang

Ghafari

et al. 2017

Adv Compos Hybrid Mater

116

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Metal oxides are widely used in many applications such as thermoelectric, solar cells, sensors, transistors, and optoelectronic devices due to their outstanding mechanical, chemical, electrical, and optical properties. For instance, their high Seebeck coefficient, high thermal stability, and earth abundancy make them suitable for thermoelectric power generation, particularly at a high-temperature regime. In this article, we review the recent advances of developing high electrical properties of metal oxides and their applications in thermoelectric, solar cells, sensors, and other optoelectronic devices. The materials examined include both narrow-band-gap (e.g., Na x CoO 2 , Ca 3 Co 4 O 9 , BiCuSeO, CaMnO 3 , SrTiO 3 ) and wide-band-gap materials (e.g., ZnO-based, SnO 2 -based, In 2 O 3 -based). Unlike previous review articles, the focus of this study is on identifying an effective doping mechanism of different metal oxides to reach a high power factor. Effective dopants and doping strategies to achieve high carrier concentration and high electrical conductivities are highlighted in this review to enable the advanced applications of metal oxides in thermoelectric power generation and beyond.

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Section: Solar Cellsmentioning

confidence: 99%

Metal oxides for thermoelectric power generation and beyond

Feng

Jiang

Ghafari

et al. 2017

Adv Compos Hybrid Mater

116

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“…More stable electron-transport materials [40][41][42][43][44] deserve to be studied in the CsPbX 3 -based PSCs to further improve the device stability. Moreover, we have first revealed the feasibility of fabricating efficient RT solution-processed all-inorganic perovskite-based devices with an inverted planar architecture via utilizing an effective solvent annealing treatment, and eventually achieved a maximum PCE over 6% in a CsPbI 2 Brbased device.…”

mentioning

confidence: 99%

Morphology Controlling of All‐Inorganic Perovskite at Low Temperature for Efficient Rigid and Flexible Solar Cells

Rao

et al. 2018

Advanced Energy Materials

126

109

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organic components with inorganic cations such as cesium (Cs + ) and rubidium (Rb + ) ions can effectively improve the thermal stability. Recently, all-inorganic cesium lead halide perovskites (CsPbX 3 , X = I, Br, Cl, or mixed halides), which have higher melting points (in excess of 460 °C), [10] have been investigated as thermal stable photoabsorption materials. The CsPbI 2 Br perovskites, which possess a reasonable bandgap of 1.9 eV and considerable phase stability, were emphasized as the main research subject in previous work. [24][25][26][27][28][29][30] To improve the performance of CsPbX 3 -based PSCs, a series of work on composition [18,19] and fabrication [20][21][22][23][24] engineerings have been intensely carried out. Unfortunately, the CsPbX 3 perovskites generally require high-temperature annealing (>250 °C) to form black photovoltaic-active cubic phase, [27][28][29][30] which is energy-consuming and undesirable for multijunction tandem and flexible solar cells. Up to now, it is still challenging to obtain uniform and void-free CsPbX 3 perovskite films via low-temperature solution-processed methods, let alone room temperature (RT) based technologies.In this work, we demonstrate that coordinated solvent dimethylsulphoxide (DMSO) can effectively induce the RT formation of photovoltaic-active CsPbX 3 perovskites, and a simple RT solvent (DMSO) annealing (RTSA) treatment can controllably remove the high boiling point DMSO and result in highly uniform and void-free CsPbX 3 perovskite films, as well as a postannealing treatment at the moderate temperature of 120 °C can further improve the perovskite grain size and crystallinity. These results provide an approach to prepare high quality allinorganic CsPbX 3 perovskite films at RT or a relatively low temperature (<120 °C). Consequently, efficient inverted CsPbI 2 Brbased PSCs were achieved on both glass and flexible substrates.As previously reported, [27] the CsPbI 2 Br perovskite precursor solution in N,N-dimethylformamide (DMF) suffers from a low concentration (≈0.43 m) due to the solubility limitation of bromide. While for the perovskite precursor solution with DMSO as solvent, the stronger coordination interaction between DMSO and the perovskite precursor enables the concentration exceeding 2 m ( Figure S1, Supporting Information), resulting in thicker perovskite films with sufficient light absorption ( Figure S2, Supporting Information). Furthermore, All-inorganic cesium lead halide (CsPbX 3 ) perovskites have emerged as promising photovoltaic materials owing to their superior thermal stability compared to traditional organic-inorganic hybrid counterparts. However, the CsPbX 3 perovskites generally need to be prepared at high-temperature, which restricts their application in multilayer or flexible solar cells. Herein, the formation of CsPbX 3 perovskites at room-temperature (RT) induced by dimethylsulphoxide (DMSO) coordination is reported. It is further found that a RT solvent (DMSO) annealing (RTSA) treatment is valid to control the perovskite cryst...

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“…In general, ah igher PL intensity corresponds to a higher radiative recombination probability in the film. [5] For the FTO/perovskite sample, the PL decay times are t 1 = 67.82 ns (74.03 %r atio), (Figure 6b andT able 1). Moreover,a mong these four Cr 2 O 3 ESLs,C r 2 O 3 -6000 ESL is the best, as the FTO/Cr 2 O 3 -6000/perovskite sample has the lowest PL intensity.The FTO/Al 2 O 3 /perovskite sample shows the highest PL intensity,i ndicating higher chargerecombination at the Al 2 O 3 layer.…”

Section: Photoelectrical Propertiesmentioning

confidence: 89%

“…[1][2][3] At present, the best known PSC device exhibits ap owerc onversion efficiency (PCE) of 22.1 %. [5] The ESL is ak ey component, [6,7] which needs to have good optical transparency and excellent chargeextracting properties. [5] The ESL is ak ey component, [6,7] which needs to have good optical transparency and excellent chargeextracting properties.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover,e fficient hole-blocking capacity is also necessary fora ne ffective ESL. These metal oxides include TiO 2 , [18] SnO 2 , [19,20] ZnO, [21,22] WO x , [23,24] Fe 2 O 3 , [5] CeO 2 , [25] Nb 2 O 5 , [26] and derivativess uch as BaSnO 3 , [27] Zn 2 SnO 4 , [28] Mg-doped metal oxides, [29] Nb-doped metal oxides, [24,30] and La-doped metal oxides. To date, the widely used ESL materials can be roughly divided into four categories: fullerene-based materials, [8][9][10] n-type conjugated polymers, [11,12] metal oxides, and metal chalcogenides.…”

Section: Introductionmentioning

confidence: 99%

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Annealing‐Free Cr₂O₃ Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells

Dong

Jia

et al. 2018

ChemSusChem

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The electron-selective layer (ESL) plays a pivotal role in the performance of perovskite solar cells (PSCs). In this study, amorphous dispersible chromium oxide (Cr O ) nanosheets are synthesized by a facile solvothermal reaction, and a Cr O ESL is prepared by spin-coating Cr O ink on fluorine-doped tin oxide substrates without need for further annealing. By using Cr O as the electron-selective layer and Cs (MA FA ) Pb(I Br ) as the light-absorption layer, a planar hybrid perovskite solar cell is fabricated. The spin-coating speed is optimized, the structure and morphology of samples are observed, the photoelectrical properties of ESLs are characterized, and the photovoltaic behaviors of devices are measured. Results show that the as-prepared Cr O layer has high optical transmittance and superb electron extraction and carrier transport property. The planar hybrid PSC based on the optimized Cr O ESL achieves a power conversion efficiency of 16.23 %, which is comparable to devices based on a conventional high-temperature-calcined TiO ESL. These results demonstrate a low-cost and facile route to highly effective perovskite solar cells.

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Hematite electron-transporting layers for environmentally stable planar perovskite solar cells with enhanced energy conversion and lower hysteresis

Abstract: Hematite electron transporting layer based planar perovskite cells were developed with reduced hysteresis and good stability in ambient air.

Cited by 99 publications

References 48 publications

Metal oxides for thermoelectric power generation and beyond

Metal oxides for thermoelectric power generation and beyond

Morphology Controlling of All‐Inorganic Perovskite at Low Temperature for Efficient Rigid and Flexible Solar Cells

Annealing‐Free Cr₂O₃ Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells

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Hematite electron-transporting layers for environmentally stable planar perovskite solar cells with enhanced energy conversion and lower hysteresis

Abstract: Hematite electron transporting layer based planar perovskite cells were developed with reduced hysteresis and good stability in ambient air.

Cited by 99 publications

References 48 publications

Metal oxides for thermoelectric power generation and beyond

Metal oxides for thermoelectric power generation and beyond

Morphology Controlling of All‐Inorganic Perovskite at Low Temperature for Efficient Rigid and Flexible Solar Cells

Annealing‐Free Cr2O3 Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells

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Annealing‐Free Cr₂O₃ Electron‐Selective Layer for Efficient Hybrid Perovskite Solar Cells