Maatwebsite Excel/Laravel - Downloading excel not working with AJAX call

Hello,

I'm developing web application with Laravel and i have some issue with the Maatwebsite export excel with an AJAX call : i don't understand why the file is not upload because i don't have any error message and the AJAX call seems to work fine.

Here is the AJAX call in the view :

            $.ajax({
                type:"post",
                url: btnExportExcel.attr('data-url-export'),
                dataType: "json",
                responseType:'blob',
                data: {
                    projetsJSON: JSON.stringify(projets)
                },
                success:function() {
                    console.log("success");
                }
            })

The controller :

    /**
     * Fonction d'export Excel
     * @return Excel
     */
    public function exportExcel(Request $request) {
        return Excel::download(new ProjetsExport($request),'projets'. date('Y-m-d') . '.xlsx');
    }

And the "ProjetExport" class :

<?php

namespace App\Exports;

use App\Models\Projet;
use Maatwebsite\Excel\Concerns\FromArray;
use Maatwebsite\Excel\Concerns\WithHeadings;
use Maatwebsite\Excel\Concerns\WithMapping;

class ProjetsExport implements FromArray, WithHeadings, WithMapping
{

    protected $request;
    
    public function __construct($request)
    {
        $this->request = $request;
    }
    
    /**
    * @return array
    */
    public function array():array
    {   
        $projets = json_decode($this->request->projetsJSON);
        return $projets;
    }

    /**
     * Initialisation des headers des colonnes du fichier Excel.
     */
    public function headings(): array
    {
        return ['Libellé','Date de création','Date de fin','Budget HT','Objectif','Etat','Type','Ouverture','Chef de projet','Famille'];
    }

    /**
     * Formattage des données.
     */
    public function map($row): array
    {
        return [
            $row->libelle,
            (new \DateTime($row->dt_creation))->format('d/m/Y'),
            (new \DateTime($row->dt_fin))->format('d/m/Y'),
            $row->budget_ht,
            $row->obj_collect,
            $row->type_proj,
            $row->ouverture,
            $row->chef_proj,
            $row->famille
        ];
    }
    
}

If someone have an idea or some clue to help me, because i'm a bit stuck right now. Thanks in advance !