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I want to make a panel of 10W18V.

Of course, first step is cutting cell

Step 1: Cut Cells to Pieces and Solder Copper Strips on Chips

Ahead of cutting cell, you should calculate how many pieces and what the size you should cut.
The voltage of a common polycrystalline silicon cell is 0.5V, whatever the size it is. So I need 18/0.5=36 pieces of chip. And 36 chips compose a 10W panel, so the power of each chip =10/36, the answer is 0.28W approximately. What is the power of a cell? I choose polycrystalline cell, 156*156mm, efficiency is 17%. This cell is around 4.1W. Now we can get the number is 4.1/0.28=14(it is must be integer). How to cut to 14 pieces? 1*14 or 2*7? I choose the cell with 2 main grid lines, and array 2*7. Now I get 78(156/2)*22.2(156/7)mm.

Length of copper strip is near twice of width of chip(width of chip is 22.2mm here). I can't solder the strips across the chip, for avoiding short circuit.

P.S. Blue face is negative.

Step 2: Connect the Chips in Series

Before this step, you could make a module, it looks like a matrix. However, it is not necessary to you, but I want it good look.

Follow the picture, put positive side upwards, and remember the principle: negative connect to positive. Connect them all in series and place in 4 lines, 9 in a line. But I want to hide tips ;)