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The magic that makes camera sensors possible is also what makes them difficult to build with the receptors on top. Because silicon is both the substrate for the sensor chip and the light-sensitive material, it wants to be both at the top and the bottom of the sensor at the same time. Traditional sensor designs simply start with the silicon and pile everything else on top. That allows for a single, relatively thick, layer of silicon and a straightforward manufacturing process.

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Omnivision helped pioneer the use of BI sensors in 2007, but until recently they have been too expensive for production use. Sony's Exmor R in 2009 was one of the first production sensors to use back-illumination -- nearly doubling its low-light sensitivity compared to other similar chips. Back-illumination broke into the mainstream when it was used in flagship phones including the Apple iPhone 4 and the HTC EVO 4G.

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Diffusing light means to soften it by reducing glare and harsh shadows. In diffused lighting, subjects will appear to have shadows with very soft edges or no edges at all. Diffused light can bring out the best in your photography subjects by minimizing blemishes and wrinkles. It can also be used to create a very soft, cinematic look. There are a number of ways to diffuse light. You can purchase professional photography equipment to soften light, but there are many ways you can improvise, using objects you already have around, to get a similar effects.

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Sony has already started sampling a stacked version of a BI chip with its Exmor RS, which is expected to ship in volume this year. As BI technology continues to improve, look for Sony to be one of the first companies to use it in their larger sensor cameras. The larger pixel size of APS-C and full-frame cameras allows a high fill factor even with traditional front-illuminated technology, but as BI gets cheaper and stacked systems allow additional features, expect it to begin to appear in mirrorless and DSLR cameras.

Diffusing light for a photoshoot can make your subjects look softer and minimize blemishes. If you don't have access to professional equipment and you need to improvise, you have a few different options, like wrapping 1 or 2 layers of bubble wrap around your camera's flash, aiming your light source at a semi-reflective white surface like a wall or poster board, or hanging a light-colored sheer fabric between your subject and the light source. You could even hang up white Chinese paper lanterns from the ceiling to help diffuse the lighting in your shot. There are also professional-level diffusers you can use if you're willing to spend more, like an on-camera flash diffuser, a softbox, or a photography umbrella. For more suggestions, like how to use diffusion paper to diffuse light, keep reading! Did this summary help you?YesNo

If a sensor was only a layer of photosensitive silicon, it wouldn't matter much which side was up. A pixel is a lot more than just the photodiode, however. It typically includes transistors and wiring for amplifying the charge, transferring it to the signal processing portion of the chip, and resetting itself between frames. Those electronics get placed on top of the silicon layer, partially obscuring it from the light and resulting in a well-like appearance for a typical pixel.

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This article was co-authored by Vlad Horol and by wikiHow staff writer, Amber Crain. Vlad Horol is a Professional Photographer and the Co-Founder of Yofi Photography, his portrait photography studio based in Chicago, Illinois. He and his wife Rachel specialize in capturing maternity, newborn, and family photos. He has been practicing photography full-time for over five years. His work has been featured in VoyageChicago and Hello Dear Photographer. This article has been viewed 197,420 times.

Better light sensitivity is just the beginning of what backside illumination makes possible. Sony has shown that BI technology allows creating a sensor from a stack of chips instead of a single chip -- so that the top chip can be optimized for capturing the light and the ones underneath can do the signal processing. A stacked design allows for additional processing at the pixel level without reducing the sensor's light sensitivity. Recent advances in through-silicon vias (TSVs; interconnects between a 3D stack of chip dies) have made this type of layering possible. This stacking is the same technology that is used in multi-layer memory chips, so it is getting significant investment.

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To get a silicon layer on top of the sensor, it is necessary to build the chip the same way as a traditional front-illuminated sensor, but then place another layer of silicon substrate on top and flip the entire silicon sandwich over. After that comes the hard part. The original base layer of silicon, which is now on top, has to be thinned to make it act as a light-sensitive layer.

Silicon is both the substrate on which chips are built and the material that performs the magic of turning photon energy into electrical energy that can be used to create images. It is therefore the simplest solution to create the photosensitive areas in the substrate silicon and stack the electronics on top -- leaving openings in the wiring over each photosite (pixel) to allow light to pass through. As camera resolutions have increased, pixel sizes have decreased, especially in smartphones with their tiny sensors. The result is that more and more of the surface area of the sensor is covered by wiring, resulting in less and less light reaching the photosites. So there is a natural need to find a way to move the photosensitive region to the top of the chip, allowing it to gather more light.

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Light bouncing around inside the electronics can also cause other problems such as vignetting and crosstalk. Thus a design which puts the photodiodes on top is clearly desirable. Having the photosensitive area on the side of the chip facing the light also dramatically improves the angular response of the sensor. No longer does light have to be aimed "down the well" of the pixel, but it can strike it from nearly any angle.

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Olympus has demonstrated how a stacked (it calls it 3D) architecture can create new possibilities with its research prototypes of a BI sensor, with a nearly perfect shutter that it calls a "global" shutter. Like a rolling shutter the global shutter can work nearly instantly and without any moving parts, but avoids artifacts by placing the read out electronics on a lower layer behind a shield. Since it takes time to read all the data from a sensor, a rolling shutter can create smearing or other artifacts because the sensor is still actively receiving photons while the voltages are being read. The Olympus design transfers all of the charge off the sensor at once -- to the lower, shielded layer -- where they can then be read out accurately.

As you'd expect, putting the photodiode at the bottom of a well reduces the amount of light that reaches it, with some light bouncing off the wiring above, and some just not having the right angle to make it to the bottom of the well. Microlenses are used to reduce this problem (the human eye uses waveguides  known as Muller cells), but a meaningful amount of light is still lost before it gets to the photodiode to be captured. Typical sensor fill factors -- the portion of light successfully captured -- range from 30% to 80%. By contrast, a back-illuminated sensor can have a fill factor of nearly 100%.

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Did You Know? Flat, diffused light is great for family, newborn, and maternity photography, because it creates a soft look. However, unfiltered light will create drama and emotion in your photos—there's no right or wrong, so experiment with both.

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