# How do I amplify the output current from a photodiode? (In photovoltaic mode)

I explain my self: we're going to make a photovoltaic cell with severals photodiods in series. Problem: the current isn't really high (I'm in photovoltaic mode, so no external biais source).

I've already looked at the transimpedance amplifier , but the thing is that for me... it just converts the current into voltage (Vout=Rf*I), but it doesn't amplify my input current ....

Are there any other way to amplify the output current ?

I just want to add that these photodiods are used in photovoltaic mode, and that i'm going to load a battery (12V maybe), with the output voltage from the PV cell . The thing is that I don't know if I really need to amplify the current (I have not so much knowledges in this field), but i thought that it would be great to do it...

• using a buffer, a simple op. amp. with a directly connected output to the - input. Commented May 14, 2018 at 14:46
• @Jakey, if this is part of a photovoltaic cell, the goal is to extract power from the the photodiode's output. Routing it through an op-amp won't do that. Commented May 14, 2018 at 14:51
• Why arrange the diodes in series? What do you expect to happen if they aren't illuminated equally (for example, when one part of the surface gets dirty)? Commented May 14, 2018 at 14:53
• Why do you want to amplify the output current? You could just use a push-pull follower, but if you're wanting to get power out of it that won't help. Commented May 14, 2018 at 15:00
• I dont know if I understood your question but, if you want to amplify the output from a photodiode without adding external sources you can: a) Choose a better photodiode b) Improve your optical mechanism c) Add more photodiodes d) Reduce the losses
– Jose
Commented May 14, 2018 at 15:32