Photo-induced degradation of lead halide perovskite solar cells caused by the hole transport layer/metal electrode interface

Figure 20. a) Modeled J − V characteristics of a perovskite device comprising ions but no traps. b) Modeled I -V characteristics of perovskite devices comprising ions and no traps for varying ion densities. c) Modeled J − V characteristics of perovskite device comprising ions and traps with varying ion mobility as indicated in the legend at a sweep rate of 100 kV s −1 . d) Modeled J -V characteristics of a perovskite device comprising ions and bulk traps. [ 211 ] 2015, American Chemical Society. e) Flow directions of the charged ion species in a Pb|MAPbI 3 |AgI |Ag cell under electrical bias. f) Images for surfaces A and B and g) a scanning electron microscope (SEM) image of surface B on the Pb pellet. h) The same cell confi guration to Figure 23 e. i) Images of each pellets after aging at 50 °C for a week in Ar atmosphere (no current stressing). Reproduced with permission. [ 212 ]

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“…Song group [ 184 ] proposed a PCE degradation mechanism occurred at HTL/metal electrode interface with light Adv. Energy Mater.…”

Section: Chemical Reactions Between Adjacent Layer Interfacesmentioning

confidence: 99%

The Progress of Interface Design in Perovskite‐Based Solar Cells

Fan

Huang

Wang

et al. 2016

Advanced Energy Materials

147

117

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“…6, 13 Similarly, stability of complete PSC devices has been investigated with relation to the same environmental factors. 6, [14][15][16][17][18] Interestingly, in addition to the perovskite-related degradation, the stability of the devices was found to greatly depend on device architecture. 17,[19][20][21][22][23][24] This was explained partly by interfacial degradation 19,25 and also by degradation of the charge transporting layers.…”

mentioning

confidence: 99%

“…17,[19][20][21][22][23][24] This was explained partly by interfacial degradation 19,25 and also by degradation of the charge transporting layers. 14,22 Recently, there have been efforts to substitute the widely-used organic Spiro-MeOTAD hole transporting layer (HTL) with inorganic materials to improve the stability of PSCs. 20,21,26 However, it is still unclear what the mechanism increasing the stability is.…”

mentioning

confidence: 99%

Not All That Glitters Is Gold: Metal-Migration-Induced Degradation in Perovskite Solar Cells

Domanski¹,

Correa‐Baena²,

et al. 2016

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Perovskite solar cells (PSCs) have now achieved efficiencies in excess of 22%, but very little is known about their long-term stability under thermal stress. So far, stability reports have hinted at the importance of substituting the organic components, but little attention has been given to the metal contact. We investigated the stability of state-of-the-art PSCs with efficiencies exceeding 20%. Remarkably, we found that exposing PSCs to a temperature of 70 °C is enough to induce gold migration through the hole-transporting layer (HTL), spiro-MeOTAD, and into the perovskite material, which in turn severely affects the device performance metrics under working conditions. Importantly, we found that the main cause of irreversible degradation is not due to decomposition of the organic and hybrid perovskite layers. By introducing a Cr metal interlayer between the HTL and gold electrode, high-temperature-induced irreversible long-term losses are avoided. This key finding is essential in the quest for achieving high efficiency, long-term stable PSCs which, in order to be commercially viable, need to withstand hard thermal stress tests.

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“…Organometallic lead halide perovskite (e.g., CH3NH3PbX3 (X=I, Br, Cl)) as light absorber layers plays critical roles in thin film solar cells as reported that the state-of-art perovskite solar cell (PSC) utilizing this kind of material has made extraordinary performance with highest efficiency exceeding 22.1% [1,2]. At present, most of the highly efficient PSCs employ sandwiched architecture of electron transporting layer (ETL)/perovskite absorber/hole transporting layer (HTL), which is initially derived from the solid state dye-sensitized solar cell.…”

Section: Introductionmentioning

confidence: 99%

Optimal design of efficient hole transporting layer free planar perovskite solar cell

Wang

Chen

et al. 2016

Sci. China Mater.

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Hole transporting layer (HTL) free organometal halide perovskite solar cells have shown great promise in simplifying device architecture, fabrication process and enhancing stability. However, the simple elimination of the HTL from the standard sandwiched configuration suffers from relatively poor device performance; additionally, the mechanism of the HTL-free perovskite solar cell is still unclear. Herein, we applied a one-dimensional modeling program wxAMPS to investigate the planar HTL-free perovskite solar cells by adjusting the absorber thickness, doping and the absorber/back contact band alignment. The simulation results reveal the importance of the moderate absorber thickness as well as the p-doping perovskite rather than intrinsic as in sandwich structure to the overall device efficiency. In the meanwhile, reducing the mismatching of the absorber/back contact by using higher work function back contact material in replacement of commonly utilized Au electrode is more favorable to improve the device performance. Through optimizing, high performance HTL-free perovskite solar cell with efficiency approaching 17% could be achieved. This study is helpful in providing theoretical guidance for the design of HTL-free perovskite solar cells.

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Photo-induced degradation of lead halide perovskite solar cells caused by the hole transport layer/metal electrode interface

Abstract: Photo-induced degradation of PSCs is caused by damage at the HTM/Au interface, which can be recovered by renewal of the Au electrode.

Cited by 98 publications

References 30 publications

The Progress of Interface Design in Perovskite‐Based Solar Cells

The Progress of Interface Design in Perovskite‐Based Solar Cells

Not All That Glitters Is Gold: Metal-Migration-Induced Degradation in Perovskite Solar Cells

Optimal design of efficient hole transporting layer free planar perovskite solar cell

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