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as led by walter sandtner in bonn germany 14 in 1994 japan followed in their footsteps and conducted a similar program with 539 residential pv systems installed 15 since then many countries have continued to produce and finance pv systems solar cells edit main article solar cell solar cells generate electricity directly from sunlight photovoltaic power potential map estimates showing how many kwh of electricity can be produced from a 1 kwp free standing c si modules optimally inclined towards the equator the resulting long term average is calculated based on weather data of at least 10 recent years photovoltaics are best known as a method for generating electric power by using solar cells to convert energy from the sun into a flow of electrons by the photovoltaic effect 16 17 solar cells produce direct current electricity from sunlight which can be used to power equipment or to recharge batteries the first practical application of photovoltaics was to power orbiting satellites and other spacecraft but today the majority of photovoltaic modules are used for grid connected systems for power generation in this case an inverter is required to convert the dc to ac there is also a smaller market for stand alone systems for remote dwellings boats recreational vehicles electric cars roadside emergency telephones remote sensing and cathodic protection of pipelines photovoltaic power generation employs solar modules composed of a number of solar cells containing a semiconductor material 18 copper solar cables connect modules module cable arrays array cable and sub fields because of the growing demand for renewable energy sources the manufacturing of solar cells and photovoltaic arrays has advanced considerably in recent years 19 20 21 cells require protection from the environment 22 and are usually packaged tightly in solar modules photovoltaic module power is measured under standard test conditions stc in w p watts peak 23 the actual power output at a particular place may be less than or greater than this rated value depending on geographical location time of day weather conditions and other factors 24 solar photovoltaic array capacity factors are typically under 25 when not coupled with storage which is lower than many other industrial sources of electricity 25 solar cell efficiencies edit this section is an excerpt from solar cell efficiency edit solar cell efficiency is the portion of energy in sunlight that is converted into electricity by a solar cell efficiency in combination with latitude and weather determine the energy output of a solar system as of 2024 the record for solar cell efficiency was 47 6 set in may 2022 by fraunhofer ise with a iii v four junction concentrating photovoltaic cpv cell 26 27 the record in real world conditions is held by nrel which developed triple junction cells with a tested efficiency of 39 5 28 29 commercial solar modules may exceed 24 efficiency 30 31 as of 2025 32 the best reached 24 5 33 typically lower than their cells in isolation the most efficient mass produced solar modules have power density values of 175 w m 2 16 22 w ft 2 34 in 2026 using triple iii v germanium cells and shingled matrix technology to interconnect cells fraunhofer achieved efficiency of 34 4 an important innovation was the use of direct cell to cell contact eliminating traditional solder coated copper ribbons and the resulting shading of active cell areas 35 schematic of charge collection by solar cells light transmits through transparent conducting electrode creating electron hole pairs which are collected by both the electrodes the absorption and collection efficiencies of a solar cell depend on the design of transparent conductors and active layer thickness 36 several factors affect conversion efficiency including its reflectance thermodynamic efficiency charge carrier separation efficiency charge carrier collection efficiency and conduction efficiency values 37 36 because these parameters are difficult to directly measure other parameters are measured instead including quantum efficiency open circuit voltage v oc ratio and fill factor reflectance losses are accounted for by the quantum efficiency value as they affect external quantum efficiency recombination losses are accounted for by these factors resistive losses are predominantly accounted for by the fill factor value but also contribute to the others depending on construction photovoltaic modules can produce electricity from a range of frequencies of light but usually cannot cover the entire solar radiation range specifically ultraviolet visible infrared and low or diffused light hence much of the incident sunlight energy is not processed by solar modules theoretically sunlight could be split into wavelength bands each a different color each directed onto cells tuned to those ranges that would convert that band more efficiently 38 performance and degradation edit chart illustrating the effect of clouds on solar energy production module performance is generally rated under standard test conditions stc irradiance of 1 000 w m 2 solar spectrum of am 1 5 and module temperature at 25 c 39 the actual voltage and current output of the module changes as lighting temperature and load conditions change so there is never one specific voltage at which the module operates performance varies depending on geographic location time of day the day of the year amount of solar irradiance direction and tilt of modules cloud cover shading soiling state of charge and temperature performance of a module or panel can be measured at different time intervals with a dc clamp meter or shunt and logged graphed or charted with a chart recorder or data logger for optimum performance a solar panel needs to be made of similar modules oriented in the same direction perpendicular to direct sunlight bypass diodes are used to circumvent broken or shaded panels and optimize output these bypass diodes are usually placed along groups of solar cells to create a continuous flow 40 electrical characteristics include nominal power p max measured in w open circuit voltage v oc short circuit current i sc measured in amperes maximum power voltage v mpp maximum power current i mpp peak power watt peak w p and module efficiency open circuit voltage or v oc is the maximum voltage the module can produce when not connected to an electrical circuit or system 41 v oc can be measured with a voltmeter directly on an illuminated module s terminals or on its disconnected cable the peak power rating w p is the maximum output under standard test conditions not the maximum possible output typical modules which could measure approximately 1 by 2 metres 3 ft 7 ft will be rated from as low as 75 w to as high as 600 w depending on their efficiency at the time of testing the test modules are binned according to their test results and a typical manufacturer might rate their modules in 5 w increments and either rate them at 3 5 3 0 or 5 0 42 43 44 degradation edit the ability of solar modules to withstand damage by rain hail heavy snow load and cycles of heat and cold varies by manufacturer although most solar panels on the u s market are ul listed meaning they have gone through testing to withstand hail 45 potential induced degradation also called pid is a potential induced performance degradation in crystalline photovoltaic modules caused by so called stray currents 46 this effect may cause power loss of up to 30 47 the largest challenge for photovoltaic technology is the purchase price per watt of electricity produced advancements in photovoltaic technologies have brought about the process of doping the silicon substrate to lower the activation energy thereby making the panel more efficient in converting photons to retrievable electrons 48 chemicals such as boron p type are applied into the semiconductor crystal in order to create donor and acceptor energy levels substantially closer to the valence and conductor bands 49 in doing so the addition of boron impurity allows the activation energy to decrease twenty fold from 1 12 ev to 0 05 ev since the potential difference e b is so low the boron is able to thermally ionize at room temperatures this allows for free energy carriers in the conduction and valence bands thereby allowing greater conversion of photons to electrons the power output of a photovoltaic pv device decreases over time this decrease is due to its exposure to solar radiation as well as other external conditions the degradation index which is defined as the annual percentage of output power loss is a key factor in determining the long term production of a photovoltaic plant to estimate this degradation the percentage of decrease associated with each of the electrical parameters the individual degradation of a photovoltaic module can significantly influence the performance of a complete string furthermore not all modules in the same installation decrease their performance at exactly the same rate given a set of modules exposed to long term outdoor conditions the individual degradation of the main electrical parameters and the increase in their dispersion must be considered as each module tends to degrade differently the behavior of the modules will be increasingly different over time negatively affecting the overall performance of the plant there are several studies dealing with the power degradation analysis of modules based on different photovoltaic technologies available in the literature according to a recent study 50 the degradation of crystalline silicon modules is very regular oscillating between 0 8 and 1 0 per year 51 on the other hand if we analyze the performance of thin film photovoltaic modules an initial period of strong degradation is observed which can last several months and up to two years followed by a later stage in which the degradation stabilizes being then comparable to that of crystalline silicon 52 strong seasonal variations are also observed in such thin film technologies because the influence of the solar spectrum is much greater for example for modules of amorphous silicon micromorphic silicon or cadmium telluride we are talking about annual degradation rates for the first years of between 3 and 4 53 however other technologies such as cigs show much lower degradation rates even in those early years manufacturing of pv systems edit see also list of photovoltaics companies overall the manufacturing process of creating solar photovoltaics is simple in that it does not require the culmination of many complex or moving parts because of the solid state nature of pv systems they often have relatively long lifetimes anywhere from 10 to 30 years to increase the electrical output of a pv system the manufacturer must simply add more photovoltaic components because of this economies of scale are important for manufacturers as costs decrease with increasing output 54 while there are many types of pv systems known to be effective crystalline silicon pv accounted for around 90 of the worldwide production of pv in 2013 manufacturing silicon pv systems has several steps first polysilicon is processed from mined quartz until it is very pure semi conductor grade this is melted down with small amounts of boron a group iii element to make a p type semiconductor rich in electron holes typically using a seed crystal an ingot of this solution is grown from the liquid polycrystalline the ingot may also be cast in a mold wafers of this semiconductor material are cut from the bulk material with wire saws and then go through surface etching before being cleaned next the wafers are placed into a phosphorus vapor deposition furnace which lays a very thin layer of phosphorus a group v element which creates an n type semiconducting surface to reduce energy losses an anti reflective coating is added to the surface along with electrical contacts after finishing the cell cells are connected via electrical circuit according to the specific application and prepared for shipping and installation 55 environmental costs of manufacture edit solar photovoltaic power is not entirely clean energy production produces greenhouse gas emissions materials used to build the cells are potentially unsustainable and will run out eventually clarification needed citation needed the technology uses toxic substances which cause pollution 56 and there are no viable technologies for recycling solar waste 57 obsolete source data required to investigate their impact are sometimes affected by a rather large amount of uncertainty the values of human labor and water consumption for example are not precisely assessed due to the lack of systematic and accurate analyses in the scientific literature 1 one difficulty in determining effects due to pv is to determine if the wastes are released to the air water or soil during the manufacturing phase 58 obsolete source life cycle assessments which look at all different environment effects ranging from global warming potential pollution water depletion and others are unavailable for pv instead studies have tried to estimate the impact and potential impact of various types of pv but these estimates are usually restricted to simply assessing energy costs of the manufacture and or transport because these are new technologies and the total environmental impact of their components and disposal methods are unknown even for commercially available first generation solar cells let alone experimental prototypes with no commercial viability 59 better source needed thus estimates of the environmental impact of pv have focused on carbon dioxide equivalents per kwh or energy pay back time epbt citation needed the epbt describes the timespan a pv system needs to operate in order to generate the same amount of energy that was used for its manufacture 60 another study includes transport energy costs in the epbt 61 the epbt has also been defined completely differently as the time needed to compensate for the total renewable and non renewable primary energy required during the life cycle of a pv system in another study which also included installation costs 62 this energy amortization given in years is also referred to as break even energy payback time 63 the lower the epbt the lower the environmental cost of solar power citation needed the epbt depends vastly on the location where the pv system is installed e g the amount of sunlight available and the efficiency of the electrical grid 61 and on the type of system namely the system s components 60 a 2015 review of epbt estimates of first and second generation pv suggested that there was greater variation in embedded energy than in efficiency of the cells implying that it was mainly the embedded energy that needs to reduce to have a greater reduction in epbt 64 in general the most important component of solar panels which accounts for much of the energy use and greenhouse gas emissions is the refining of the polysilicon 60 as to how much percentage of the epbt th...