Journal
SCIENCE
Volume 360, Issue 6396, Pages 1442-1446Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aap9282
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Funding
- 973 Program of China [2015CB932203]
- National Natural Science Foundation of China [61722501, 91733301, 91433203, 61377025]
- EPSRC (UK)
- European Union Seventh Framework Programme under the MESO project [604032]
- AFOSR [FA9550-15-1-0115]
- Royal Society Research Grant [RG160742]
- Royal Society International Exchanges Scheme [IE160511]
- University of Surrey Sustainability Conference Support Programme
- EPSRC
- Indo-UK APEX
- UKIERI projects
- Newton-Bhabha international fellowship
- Engineering and Physical Sciences Research Council [EP/R043272/1, EP/M024881/1] Funding Source: researchfish
- EPSRC [EP/R043272/1, EP/M024881/1] Funding Source: UKRI
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The highest power conversion efficiencies (PCEs) reported for perovskite solar cells (PSCs) with inverted planar structures are still inferior to those of PSCs with regular structures, mainly because of lower open-circuit voltages (V-oc). Here we report a strategy to reduce nonradiative recombination for the inverted devices, based on a simple solution-processed secondary growth technique. This approach produces a wider bandgap top layer and a more n-type perovskite film, which mitigates nonradiative recombination, leading to an increase in V-oc by up to 100 millivolts. We achieved a high V-oc of 1.21 volts without sacrificing photocurrent, corresponding to a voltage deficit of 0.41 volts at a bandgap of 1.62 electron volts. This improvement led to a stabilized power output approaching 21% at the maximum power point.
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