There has been research done over the years on this topic.  We all know that black objects absorb the energy of the sun and get warm, so one might think that these panels will warm up the area as well. 

As in the sample images of the Topaz Solar Plant this is not always the case.

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Here are a selection of pertinent research papers on this:

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• Fthenakis, Vasilis, Yuanhao Yu, and Rebecca Winter. Analysis of the Potential for a Heat Island Effect in Large Solar Farms. Proc. of 39th IEEE Photovoltaic Specialists Conference, Tampa, Florida. Center for Life Cycle Analysis, Columbia University, 21 June 2013. Web. 1 Dec. 2016. <http://www.clca.columbia.edu/13_39th%20IEEE%20PVSC_%20VMF_YY_Heat%20Island%20Effect.pdf>.

• Turney, Damon, and Vasilis Fthenakis. "Environmental Impacts from the Installation and Operation of Large-scale Solar Power Plants." Environmental Impacts from the Installation and Operation of Large-scale Solar Power Plants. National Photovoltaic Environmental Research Center, 17 May. 2011. Web. 06 Dec. 2016. <http://www.sciencedirect.com/science/article/pii/S1364032111001675>.

• Levitan, Dave. "Rooftop Solar Panels Double as Cooling Agents." IEEE Spectrum: Technology, Engineering, and Science News. IEEE   Spectrum, 20 July 2011. Web. 06 Dec. 2016. <http://spectrum.ieee.org/energywise/green-tech/solar/rooftop-solar-panels-double-   as-cooling-agents>.

• Dominguez, Anthony, Jan Kleissl, and Jeffrey Luvall. "Effects of Solar Photovoltaic Panels on Roof Heat Transfer." Effects of Solar   Photovoltaic Panels on Roof Heat Transfer. University of California, San Diego, Department of Mechanical and Aerospace   Engineering, 6 July 2011. Web. 06 Dec. 2016. <http://www.sciencedirect.com/science/article/pii/S0038092X11002131>.