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$worksheet1->write(0,1,"Modules", $format);
$worksheet1->write(0,2,"Excel");
$worksheet1->write(0,3, "Dumper");

Modules    Excel    Dumper

$worksheet1->write(0,1,"Modules", $format);
$worksheet1->write(1,1,"Excel");
$worksheet1->write(2,1, "Dumper");

Modules
Excel
Dumper

$worksheet1->write(0,0,"A1");
$worksheet1->write(0,1,"B1");
...
$worksheet1->write(2,0,"A3");
$worksheet1->write(2,1,"B3");
$worksheet1->write(2,2, "C3");

A1    B1    C1
A2    B2    C2
A3    B3    C3