In this study we propose a new design to place the contacts for both p-type and n-type semiconductors at the bottom of solar cell to increase photons entering the absorber layer. The fabricated device contains periodic nanopillars of ∼243 nm radius and centre to centre pillar distance of ∼550 nm. In addition to the fabrication, thin films of n-CdS and p-CdTe have been characterised for their material properties at different annealing temperatures in this study. The X-ray diffraction pattern for CdTe and CdS revealed that the growth is preferentially along the (111) plane with a cubic zinc blend and cubic structure, respectively. Optimum absorption of the solar spectrum for a single junction solar cell occurs with the optical band gap of 2.36 eV for CdS and 1.45 eV for CdTe. The significance of the work creates a new beginning for the fabrication of textured thin film photovoltaic cell.
KhannaA, BasuPK, FilipovicA, Influence of random pyramid surface texture on silver screen-printed contact formation for monocrystalline silicon wafer solar cells. Sol Energy Mater Sol Cells. 2015;132:589–596. DOI:10.1016/j.solmat.2014.10.018.
2.
KimJK, LeeK, CoatesNE, Efficient tandem polymer solar cells fabricated by all-solution processing. Science. 2007;317:222–225. doi: 10.1126/science.1141711
3.
LinCC, ChuangYJ, SunWH, Ultrathin single-crystalline silicon solar cells for mechanically flexible and optimal surface morphology designs. Microelectron Eng. 2015;145:128–132. doi: 10.1016/j.mee.2015.04.013
4.
TianB, ZhengX, KempaTJ, Coaxial silicon nanowires as solar cells and nanoelectronic power sources. Nature. 2007;449:885–889. doi: 10.1038/nature06181
5.
SelvanG, AbubackerMP, UsharaniK, Precursor aging effect on the properties of CdZnS films. Surf Eng. 2016;32:212–217. doi: 10.1080/02670844.2015.1111559
6.
FanZ, RazaviH, DoJ-W, Three-dimensional nanopillar-array photovoltaics on low-cost and flexible substrates. Nat Mater. 2009;8:648–653. doi: 10.1038/nmat2493
7.
LiJ, YuH, WongSM, Si nanopillar array optimization on Si thin films for solar energy harvesting. Appl Phys Lett. 2009: 95. DOI:10.1063/1.3186046 doi: 10.1016/j.physletb.2009.02.004
8.
FanZ, KapadiaR, LeuPW, Ordered arrays of dual-diameter nanopillars for maximized optical absorption. Nano Lett. 2010;10:3823–3827. doi: 10.1021/nl1010788
9.
LiuC-H, ChenC-H, ChenS-Y, Large scale single-crystal Cu(In,Ga)Se2 nanotip arrays for high efficiency solar cell. Nano Lett. 2011;11:4443–4448. doi: 10.1021/nl202673k
10.
KrogstrupP, JørgensenHI, HeissM, Single-nanowire solar cells beyond the Shockley–Queisser limit. Nat Photonics. 2013;7:306–310. doi: 10.1038/nphoton.2013.32
11.
SivaramanT, NagarethinamVS, BaluAR.Properties of CdS films doped with magnesium and fluorine. Surf Eng. 2016;32:596–600. doi: 10.1080/02670844.2016.1161948
12.
NarasimmanV, NagarethinamVS, SelvanG, Bromine doping effect on some properties of CdS films. Surf Eng. 2017;33:175–180. doi: 10.1080/02670844.2016.1201184
13.
WuS, HanH, TaiQ, Enhancement in dye-sensitized solar cells based on MgO-coated TiO2 electrodes by reactive DC magnetron sputtering. Nanotechnology. 2008;19:215704. DOI:10.1088/0957-4484/19/21/215704.
14.
ChunS, HanKS, ShinJH, Fabrication and characterization of CdTe nano pattern on flexible substrates by nano imprinting and electrodeposition. Microelectron Eng. 2010;87:2097–2102. doi: 10.1016/j.mee.2010.01.004
15.
AnttuN, XuHQ.Coupling of light into nanowire arrays and subsequent absorption. J Nanosci Nanotechnol. 2010;10:7183–7187. doi: 10.1166/jnn.2010.2907
16.
OrhanJ-B, MonnardR, Vallat-SauvainE, Nano-textured superstrates for thin film silicon solar cells: status and industrial challenges. Sol Energy Mater Sol Cells. 2015;140:344–350. doi: 10.1016/j.solmat.2015.04.027
17.
IlangoMS, MutalikesaiA, RamaseshaAK.Anodization of aluminium using a fast two-step process. J Chem Sci. 2016;128:153–158. doi: 10.1007/s12039-015-1006-8
18.
NithyayiniKN, RamaseshaSK.Fabrication of semi-transparent photovoltaic cell by a cost-effective technique. Metall Mater Trans E. 2015;2:157–163.
19.
GoudaL, AniruddhaYR, RamaseshaSK.Correlation between the solution chemistry to observed properties of CdTe thin films prepared by CBD Method. J Mod Phys. 2012;3:1870–1877. doi: 10.4236/jmp.2012.312235
20.
LinH, IrfanXia W, MoOx back contact for CdS/CdTe thin film solar cells: preparation, device characteristics, and stability. Sol Energy Mater Sol Cells. 2012;99:349–355. doi: 10.1016/j.solmat.2012.01.001
21.
RavichandranK, MurugananthamG, SakthivelB, CdS films from two different low cost techniques for solar cell applications – a comparative study. Surf Eng. 2010;26:590–595. doi: 10.1179/174329409X455403
22.
HangarterCM, HamadaniBH, GuyerJE, Three dimensionally structured interdigitated back contact thin film heterojunction solar cells. J Appl Phys. 2011;109:073514. DOI:10.1063/1.3561487.
23.
IlangoMS, MonterioV, RamaseshaSK.Fabrication of back contacts using laser writer and photolithography for inscribing textured solar cells. Bull Mater Sci. 2015;38:191–196. doi: 10.1007/s12034-014-0819-2
24.
MishraS, NathM.Growth of vertically aligned CdTe nanorod arrays through patterned electrodeposition. Nano Energy. 2013;2:1207–1213. doi: 10.1016/j.nanoen.2013.05.004
25.
LeungSF, ZhangQ, XiuF, Light management with nanostructures for optoelectronic devices. J Phys Chem Lett. 2014;5:1479–1495. doi: 10.1021/jz500306f
26.
BozzolaA, KowalczewskiP, LiscidiniM, Light absorption and carrier collection in thin-film crystalline silicon solar cells with light trapping. 2014 16th Int. Conf. Transparent Opt. Networks IEEE. 2014: 1–4. DOI:10.1109/ICTON.2014.6876594.
27.
LeeJH, LimDG, YiJS.Electrical and optical properties of CdTe films prepared by vacuum evaporation with close spacing between source and substrate. Sol Energy Mater Sol Cells. 2003;75:235–242. doi: 10.1016/S0927-0248(02)00165-4
28.
ShaabanER, AfifyN, El-TaherA.Effect of film thickness on microstructure parameters and optical constants of CdTe thin films. J Alloys Compd. 2009;482:400–404. doi: 10.1016/j.jallcom.2009.04.033
29.
ElilarassiR, MaheshwariS, ChandrasekaranG.Structural and optical characterization of CdS nanoparticles synthesized using a simple chemical reaction route. Optoelectron Adv Mater Rapid Commun. 2010;4:309–312.
30.
GunjalSD, KhollamYB, JadkarSR, Spray pyrolysis deposition of p-CdTe films: structural, optical and electrical properties. Sol Energy. 2014;106:56–62. doi: 10.1016/j.solener.2013.11.029
31.
RahmanKS, HaqueF, KhanNA, Influence of thermal annealing on CdTe thin film deposited by thermal evaporation technique. Proc. 2014 3rd Int. Conf. Dev. Renew. Energy Technol., IEEE. 2014. doi: 10.1109/ICDRET.2014.6861722
32.
HanapiahMM, SinYK, IbrahimK, The effect of dose exposure in electron beam lithography. AIP Conference Proc. 2008: 1017. DOI:10.1063/1.2940684.
