Formula not working in PHPExcel Can you help?

Question

PHP

There is a formula: =$'01'.$E14
Which means: take from sheet 01, data from cell E14.
After creating an excel file with PHPExcel, this formula doesn't work.
But when in excel in this formula you erase some data (for example: 14), and return it again, the formula works.
The formula is set like this:
$objPHPExcel->getActiveSheet()->setCellValue('E14', "=\$'01'.\$E14");
If anything, the file is generated: Excel2007