Abstract
Monolithic perovskite/silicon tandem solar cells recently surpass the efficiency of silicon single‐junction solar cells. Most tandem cells utilize >250 μm thick, planarized float‐zone (FZ) silicon, which is not compatible with commercial production using <200 μm thick Czochralski (CZ) silicon. The perovskite/silicon tandem cells based on industrially relevant 100 μm thick CZ‐silicon without mechanical planarization are demonstrated. The best power conversion efficiency (PCE) of 27.9% is only marginally below the 28.2% reference value obtained on the commonly used front‐side polished FZ‐Si, which are about three times thicker. With both wafer types showing the same median PCE of 27.8%, the thin CZ‐Si‐based devices are preferred for economic reasons. To investigate perspectives for improved current matching and, therefore, further efficiency improvement, optical simulations with planar and textured silicon have been conducted: the perovskite's bandgap needs to be increased by ≈0.02 eV when reducing the silicon thickness from 280 to 100 μm. The need for bandgap enlargement has a strong impact on future tandem developments ensuring photostable compositions with lossless interfaces at bandgaps around or above 1.7 eV.
Highlights
Today's photovoltaic market is dominated by crystalline silicon-based solar cell technology
We demonstrate for the first time monolithic perovskite/silicon tandem solar cells based on thin non-CMP n-type CZ-silicon bottom cells
We demonstrated perovskite/silicon tandem solar cells based on industrially relevant silicon bottom cells, namely, 100 μm thin CZ-wafer with an industrial deployed chemical polishing for the front side and a textured rear side
Summary
Today's photovoltaic market is dominated by crystalline silicon-based solar cell technology. S. Albrecht Faculty IV – Electrical Engineering and Computer Science Technical University Berlin 10587 Berlin, Germany. Www.advancedsciencenews.com www.solar-rrl.com the highest scientifically reported efficiency of 29.15% is close to the theoretical limit of silicon single-junction solar cells.[15] With a certified efficiency of 29.52%, Oxford PV surpassed this limit but did not disclose any further details.[16]. These high efficiencies are achieved on rather thick front-side polished float-zone (FZ) silicon heterojunction solar cells, which are industrially not relevant for three reasons: 1) chemical–mechanical polishing (CMP) is time consuming and expensive. The reduced response in the IR region for thinner bottom cells will shift the optimal top cell bandgap for standard test conditions toward larger energies
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
