Although the commercial application of solar cells pursues scalable and large-area devices, small-area solarcells on a scale of several centimeters possess many advantages such as low fabrication cost and facile high-throughput screening in the research laboratory. Most emerging photovoltaic technology starts from thestudying of small-area devices. Recently, perovskite/silicon tandem solar cells have aroused extensive researchinterest because they can break through the radiative efficiency limit of single-junction solar cells. However,when commercial large-area silicon cells are cut into small pieces with a few squared centimeters in area forlaboratory use, there occurs a significant efficiency loss, limiting the performance of tandem cells. Herein, toeliminate the thermal damage caused by the traditional laser cutting method and also reduce the non-radiativerecombination of heterojunction silicon cells after being cut, a cold-manufacturing method of grinding wheeldicing is used to cut heterojunction silicon cells. This method is realized by high-speed mechanical grindingaccompanied by liquid washing, which avoids damaging the edge of solar cell caused by heat. Compared withthe device cut by laser, the heterojunction silicon cells cut by the cold-manufacturing method exhibit less cross-sectional damage. The measurements by scanning electron microscopy (SEM) and three-dimensional opticalprofilometer reveal that the morphology of the device edge is smoother than the counterpart cut by laser.Device physics measurements including electrochemical impedance spectrum(EIS), dark current-voltage curves,transient photovoltage (TPV), transient photocurrent (TPC), and the dependence of short-circuit currentdensity and open-circuit voltage on light intensity reveal that the cold-manufacturing method can significantlyprevent the heterojunction silicon cells from non-radiatively recombining after being cut. These results indicatethat the edge-recombination of the silicon solar cells cut by grinding wheels is reduced compared with that cutby laser. As a result, statistical analysis of the device performance reveals that both the open-circuit voltage andfill factor of the device are improved, and the average photoelectric conversion efficiency increases by anabsolute efficiency of similar to 1%. Stacking the obtained silicon cells with the normal transparent perovskite solar cells,the obtained four-terminal perovskite/silicon tandem solar cells deliver an efficiency of over 28%. This workemphasizes the importance of reducing efficiency loss during manufacturing the heterojunction silicon solar cellin fabricating high-performance silicon-based tandem solar cells
