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. 2021 Oct 26;6(44):29982–29992. doi: 10.1021/acsomega.1c04521

Table 1. Categorical Features and Variables of the Hydrothermally Synthesized ZnO DSSCs.

categorical feature variables of the DSSCs number of experimental observations
morphological structures microstructure (0): microflower, microrod, microsheet, microsphere, and microurchin 30
  nano-1D (1): nanobullets, nanocone, nanoforest, nanograss, nanoneedles, nanorod, nanotree, nanotube, and nanowire 193
  nano-2D (2): nanobead, nanobelt, nanocrystal, nanodisk, nanoflakes, nanoplates, nanosheet 34
  nano-3D (3): nanocaterpillar, nanocluster, nanocubes, nanoflower, nanomushrooms, nanoparticle, nanopyramid, nanosphere, nanostar, and nanourchin 41
precursors precursor 1: zinc nitrate 216
  precursor 2: zinc acetate 68
  precursor 3: zinc chloride 14
dyes dye 1: N719 222
  dye 2: N3 21
  dye 3: D102 8
  dye 4: D149 8
  dye 5: natural dye, rodhamine B, eosin-Y, D205, mercurochrome, Z907, LEG-4, and C-218 39
synthesis temperature low: 40–90 °C 110
  medium: 90–95 °C 18
  high: 95–120 °C 37
  very high: 120–220 °C 133
synthesis time low: 0.5–3 h 79
  medium: 3–6 h 72
  high: 6–12 h 78
  very high: 12–144 h 69
seed layer present 183
  absent 115
PCE minimum: 0.005%  
  first Quartile (Q1): 0.33%  
  second quartile (Q2): 0.93% 298
  third quartile (Q3): 1.94%  
  maximum: 7.66%