Fundamental Studies of Adhesion of Dust to PV Module Surfaces: Chemical and Physical Relationships at the Microscale

Photovoltaic (PV) module soiling is a growing area of concern for performance and reliability. This paper provides evaluations of the fundamental interactions of dust/soiling particles with several PV module surfaces. The purpose is to investigate the basic mechanisms involving the chemistry, morphology, and resulting particle adhesion to the first photon-incident surface. The evaluation and mapping of the chemistry and composition of single dust particles collected from operating PV module surfaces are presented. The first correlated direct measurements of the adhesive force of individual grains from field-operating collectors on identical PV module glass are reported, including correlations with specific compositions. Special microscale atomic force microscopy techniques are adapted to determine the force between the particle and the module glass surface. Results are presented for samples under dry and moisture-exposed conditions, confirming the effects of cementation for surfaces having soluble mineral and/or organic concentrations. Additionally, the effects of hydrocarbon fuels on the enhanced bonding of soiling particles to surfaces are determined for samples from urban and highly trafficked regions. Comparisons between glass and dust-mitigating superhydrophobic and superhydrophilic coatings are presented. Potential limitations of this proximal probe technique are discussed in terms of results and initial proof-of-concept experiments.

[1]  Othmar Marti,et al.  Combined scanning force and friction microscopy of mica , 1990 .

[2]  K. Brown,et al.  Soiling test methods and their use in predicting performance of photovoltaic modules in soiling environments , 2012, 2012 38th IEEE Photovoltaic Specialists Conference.

[3]  Rohit Pillai,et al.  Impact of dust on solar photovoltaic (PV) performance: Research status, challenges and recommendations , 2010 .

[4]  N. Amer,et al.  Novel optical approach to atomic force microscopy , 1988 .

[5]  Gianluca Timò,et al.  Superhydrophilic self-cleaning surfaces based on TiO2 and TiO2/SiO2 composite films for photovoltaic module cover glass , 2015, Applied Adhesion Science.

[6]  R. Neumann,et al.  Analysis of lateral force effects on the topography in scanning force microscopy , 1994 .

[7]  S. Moon,et al.  Contact angles of liquid drops on super hydrophobic surfaces: understanding the role of flattening of drops by gravity. , 2010, Langmuir : the ACS journal of surfaces and colloids.

[8]  Michael Hannigan,et al.  Impact of natural soiling on the transmission of PV cover plates , 2013, 2013 IEEE 39th Photovoltaic Specialists Conference (PVSC).

[9]  B. Bhushan,et al.  Atomic-Scale Friction Measurements Using Friction Force Microscopy: Part II—Application to Magnetic Media , 1993 .

[10]  Scott R. Hunter,et al.  Monolithic graded-refractive-index glass-based antireflective coatings: broadband/omnidirectional light harvesting and self-cleaning characteristics , 2015 .

[11]  M. M. Beheary,et al.  Effect of dust on the transparent cover of solar collectors , 2006 .

[12]  Robert W. Carpick,et al.  Lateral force calibration in atomic force microscopy: A new lateral force calibration method and general guidelines for optimization , 2006 .

[13]  O. Marti.  Measurement of Adhesion and Pull-Off Forces with the AFM , 2000 .

[14]  M. Ray,et al.  Kinetics and mechanisms of UV-photodegradation of chlorinated organics in the gas phase. , 2002, Water research.

[15]  Kurt Leschonski,et al.  Representation and Evaluation of Particle Size Analysis Data , 1984 .

[16]  Zhibing Zhang,et al.  Matching the nano- to the meso-scale: Measuring deposit–surface interactions with atomic force microscopy and micromanipulation , 2010 .

[17]  Fairouz Iberraken,et al.  Competing Risk of Degradation Processes of a Photovoltaic System under Several Conditions , 2014 .

[18]  A. Modaihsh.  Characteristics and composition of the falling dust sediments on Riyadh city, Saudi Arabia , 1997 .

[19]  Othmar Marti,et al.  Scanning force and friction microscopy , 1992 .

[20]  Lawrence L. Kazmerski,et al.  Ashes to ashes, dust to dust: Averting a potential showstopper for solar photovoltaics , 2014, 2014 IEEE 40th Photovoltaic Specialist Conference (PVSC).

[21]  P. Hansma,et al.  An atomic-resolution atomic-force microscope implemented using an optical lever , 1989 .

[22]  Edward F. Cuddihy,et al.  Theoretical considerations of soil retention , 1980 .

[23]  B. Bhushan,et al.  Scanning Probe Microscopy— Principle of Operation, Instrumentation, and Probes , 2010 .

[24]  U. Landman,et al.  Nanotribology: friction, wear and lubrication at the atomic scale , 1995, Nature.

[25]  Keith Bonin,et al.  Easy and direct method for calibrating atomic force microscopy lateral force measurements. , 2007, The Review of scientific instruments.

[26]  Charles M. Lieber,et al.  Chemical Force Microscopy , 1997, Microscopy and Microanalysis.

[27]  Syed A.M. Said,et al.  Fundamental studies on dust fouling effects on PV module performance , 2014 .

[28]  R. B. Pettit,et al.  Effect of soiling on solar mirrors and techniques used to maintain high reflectivity , 1980 .

[29]  K. Ip,et al.  Dust effect on flat surfaces – A review paper , 2014 .

[30]  Malay K. Mazumder,et al.  Characterization of Electrodynamic Screen Performance for Dust Removal from Solar Panels and Solar Hydrogen Generators , 2011, IEEE Transactions on Industry Applications.

[31]  A. Sayyah,et al.  Energy yield loss caused by dust deposition on photovoltaic panels , 2014 .

[32]  L. Belyakova,et al.  Surfaces properties of silica gels modified with hydrophobic groups , 1999 .

[33]  Elton N. Kaufmann,et al.  Characterization of materials , 2003 .

[34]  Friction and Wear on the Atomic Scale , 2003 .

[35]  Hai Jiang,et al.  Experimental investigation of the impact of airborne dust deposition on the performance of solar photovoltaic (PV) modules , 2011 .

[36]  Spherical AFM Probes for Adhesion Force Measurements on Metal Single Crystals , 2007 .

[37]  Lawrence L. Kazmerski,et al.  A comprehensive review of the impact of dust on the use of solar energy: History, investigations, results, literature, and mitigation approaches , 2013 .

[38]  Bruce H. King,et al.  Spectral Sensitivity of Simulated Photovoltaic Module Soiling for a Variety of Synthesized Soil Types , 2014, IEEE Journal of Photovoltaics.

[39]  Michael Gostein,et al.  PV module soiling measurement uncertainty analysis , 2013, 2013 IEEE 39th Photovoltaic Specialists Conference (PVSC).

[40]  Kamaruzzaman Sopian,et al.  Effect of Dust Deposition on the Performance of Multi-Crystalline Photovoltaic Modules Based on Experimental Measurements , 2013 .

[41]  N. Faraj.  Self-Cleaning Solar Panels to Avoid the Effects of Accumulated Dust on Solar Panels Transmittance , 2013 .

[42]  Malay K. Mazumder,et al.  Performance restoration of dusty photovoltaic modules using electrodynamic screen , 2015, 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC).

[43]  B. Spehar,et al.  Prediction of diesel fuel properties by vibrational spectroscopy using multivariate analysis , 2012, Journal of Analytical Chemistry.