Architecture is a reflection of the civilization of people and the spirit of the times and is now witnessing an era of ideological shifts in the field of architecture influenced by the revolution of technology and information that imposed itself on the scientific and architectural arenas. Even though the continuation of this technological development is strong, it began to negatively impact society in the following ways:

Architectural creativity has not stopped from the traditional methods of design in terms of aesthetics of proportions and function. However, contemporary creativity has joined the integration of modern technology and technology in architecture whether at the level of design, construction or execution or in building materials, which aim to achieve the best products that seek the benefit and well-being of the building using environmentally friendly methods that ensure the sustainability of its resources. Solar energy in Egypt is one of the most important sources of alternative and renewable energy. Solar cells have witnessed wide applications in all aspects of our daily lives. This is because we have a huge amount of solar energy in our Arab countries. Despite the steady expansion in the areas of its use, it still faces some obstacles and difficulties, the most important being its inefficiency and high price. In the long term, many researchers are now using the latest nanotechnology to try to develop solar cells that are more sustainable, efficient and less expensive.

Here are questions that come to mind:

The concept of sustainable design can be summed up as a design that seeks to reduce the negative impacts on the environment, ensure health and comfort for the occupants of the building, and thereby improving the building’s performance and achieving the basic objectives of sustainability such as reducing the consumption of non-renewable resources (Figure 1) (Eid, 2010). There are several factors needed to reach sustainable design:

Many of the pioneers of sustainability in architecture and many professional and academic organizations have worked hard to develop sustainability tools (Figure 2). To make these tools available, concrete, building design should be long and play its role throughout time to be resistant to natural disasters. This means that the building achieves the maximum utilization rates of energy, water and materials regarding the following issues:

Solar cells are devices that convert solar energy into electricity (Figure 3), either directly through the photovoltaic effect or indirectly by the initial conversion of solar energy to heat or chemical energy. The most common form of cells for solar energy is the photovoltaic effect so that a light emitting diode, on a two-semiconductor device, has a difference in voltage between the layers. This voltage is capable of running a current through an external circuit of this power supply (Goetzberger & Hoffmann, 2005).

Many definitions of nanotechnology are presented by experts and researchers. Most of these definitions are similar in terms of content, concept, and/or their private and public status. They can be summarized in the following concept: "It is the search, control or control of the internal matter environment at the atomic or molecular scale by restructuring and arranging atoms their component molecules, deal with structures of sizes between 1 and 100 nm in the design, production, characterization and application of unique materials, structures and systems" (Ashby & Schodek, 2009).

Nanomaterials have many terms for many international organizations:

The 6th of October city will be highlighted as follows:

RET is the program used in our research, which was developed by the Natural Resources Academy of Canada, and the first version of the program was published in 1996 (RET Screen V.1), which was developed by the Academy until 2007 to reach the fourth issue (RET Screen V.4). It was also developed in 2014 to its latest release, RET Screen Expert (Figure 8), the latest version can be downloaded from the Academy website (Renewable Energy Technologies Screen, n.d.).

The research ends with the results of the case study of the Raya Plaza building in 6 th of October city. The photovoltaic systems manufactured by the nanotechnology industry are higher than their current counterparts which produce 108.261 m.w.h compared to normal cells, which produce 96.174 m.w.h. photovoltaic systems can achieve high performance in the generation of rate electric cells when compared to ordinary cell. This is because the cells manufactured using nanotechnology are characterized by the effectiveness of time, in the long and short run, where they are to maintain the production of electrical energy in comparison. Moreover, these photovoltaic systems may achieve proper thermal insulation for the roof by using nanoparticles during the manufacturing process of solar cells. As a result, thermal insulation is improved. Finally, a coefficient-based study found that these systems can be technically applied to the model chosen.

The paper showed the need to use nanotechnology in solar cells because of its efficiency, but at the same time, the urgent need to continue scientific research in this field to reach the best product at the lowest cost.